How To Clean A Wastemaster For A Caravan




wastemaster cleaning fluid

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How To Clean A Wastemaster For A Caravan


Caravanning is a fantastic way to explore the great outdoors, but maintaining your caravan’s cleanliness and hygiene is essential for an enjoyable experience. One crucial component often overlooked is the wastemaster – responsible for managing your wastewater disposal.

In this blog post, we will guide you through cleaning your Wastemaster to keep it in top condition, ensuring smooth operation during all your adventures.


If you just want a recommendation of a wastermaster cleaner, you can’t go far wrong with this product from Thetford:

Thetford 30700AK Grey Water Fresh Concentrated, 800 ml (Pack of 1)*
  • Odourless emptying of the grey water tank.
  • Keeps the grey water fresh and clean for longer

Key Takeaways

  • Regular cleaning is essential to maintain hygiene and prevent odours and blockages.
  • Use eco-friendly products that are safe for you, your pets and the environment.
  • Store it properly in a dry, cool place away from direct sunlight and check it regularly for leaks or damage.
  • Avoid using harsh chemicals or overfilling, as this can cause damage to the system.

Understanding Your Wastemaster

The Wastemaster is a crucial component of your water disposal system and must be kept spotless to prevent unpleasant odours and blockages.

What Is A Wastemaster And Why It Is Important To Keep It Clean

It is a portable holder specifically designed for caravans, which plays a crucial role in managing and disposing of grey water produced during your stay at a campsite. Grey water comes from your sinks and shower.

It ensures the overall cleanliness of your caravan by eliminating any unpleasant odours caused by wastewater accumulation. Moreover, it reduces the risk of bacterial contamination that may lead to health issues for you and your fellow campers.

A well-maintained Wastemaster also helps prevent leaks or damage due to blockages formed over time by sediment buildup from tea or coffee stains, food particles and soap residue.

How A Does It Work?

It’s an essential piece of kit. It collects wastewater from sinks, showers (but not the toilet!), draining into a a plastic tank under the caravan.

The system relies on gravity to transfer the wastewater through the waste pipe and into the tank. It is essential to position your caravan on level ground when setting up camp to ensure efficient drainage.

Steps To Clean A Wastemaster

Start by pouring out the contents and rinsing it carefully. Then, prepare a solution using household items such as diluted bleach or dishwasher tablets.

Apply the solution and scrub it with a toilet brush before rinsing meticulously. There are also commercial products available to assist with the cleaning :

Thetford 30700AK Grey Water Fresh Concentrated, 800 ml (Pack of 1)*
  • Odourless emptying of the grey water tank.
  • Keeps the grey water fresh and clean for longer
  • Excellent odour control of grey water.
  • Reduces the formation of deposits in grey water tank.
  • Dosage is based on a grey water tank capacity of 100L. 1 dose lasts up to 5 days.

Empty And Rinse

Empty and rinse it. This might seem obvious, but ensuring you’ve cleared all the waste water out of the tank before cleaning is essential.

If you’re dealing with tea or coffee staining in your Wastemaster, dilute some bleach in hot water and pour it into the tank before rinsing it. Alternatively, you can use pink flush fluid or a dishwasher tablet to soften the gunk.

Prepare A Cleaning Solution

You must gather a few supplies. Add hot water and some detergent or dishwashing soap.

You can use any eco-friendly consumables that you have on hand.

Consider using a dishwasher tablet to help dissolve any buildup inside the tank. Once all your agents are in place, stir the solution well with a toilet brush or similar tool before pouring it in.

Be sure to agitate it well while scrubbing away any stubborn dirtiness that won’t come off easily.

Apply The Solution And Scrub

It’s now time to apply it and scrub it. Using a toilet brush or any other stiff-bristled brush, start from the top and work your way downwards in a circular motion.

If you encounter tough stains that won’t come off quickly, consider using a dishwasher tablet or diluted bleach to soften them before scrubbing again.

Once done, rinse all remnants of soap residue by pouring hot water into it while draining it via one of it’s holes. Repeat this step several times until no suds are left in sight.

Always wear gloves when handling chemicals and avoid mixing different consumables together as some may react violently, resulting in toxic fumes or explosions, which is harmful and dangerous.

Aqua Kem Duo Tank Cleaner 0.78L*
  • Removes limescale, encrusting and grease deposits
  • Technical parts inside the tanks are cleaned as well
  • Prolongs the lifespan of the tanks
  • No scrubbing required!
  • Cleaning without damaging the technical parts inside the tanks

Rinse Completely

Once you have applied the solution and scrubbed it, is crucial to rinse it. If yours isn’t to dirty, you might be able to just left to solution soak once poured in. Always follow the manufacturer’s recommendations. Remember to use fresh water so that no leftover traces of detergent or bleach are left.

Repeat the steps if you notice any remaining stains or dirt after rinsing until satisfied. It is also recommended to let it dry completely before storing it away.

Tips For Maintaining A Wastemaster

To keep it in good order, use eco-friendly consumables regularly, store it properly and disinfect it after each use, and check for leaks or damage to ensure a longer lifespan.

Clean Regularly With Eco-friendly Products

You can find many natural alternatives like diluted bleach, tea tree oil, vinegar or lemon juice that do not harm the environment. These are available from most camping equipment shops.

Avoid harsh chemicals as they might damage the plastic material. Going green also means being mindful of water usage.

Try using greywater from activities such as washing-up dishes or clothes to rinse away detergents used during these activities instead of wasting fresh water from an external source; this will reduce both costs and environmental impact.

Store The Wastemaster Properly And Use A Disinfectant

It is crucial to store it correctly to prevent any bacteria buildup. Ensure you keep it in a dry and cool place, away from direct sunlight.

Also, ensure the caps are tightly secured on the tank during storage. If possible, avoid stacking anything heavy on top of it, as it can cause damage or cracks in the plastic over time.

Check For Leaks Or Damage

Aquaroll Wastemaster

It is important to check your wastemaster for any leaks or damage regularly. Inspect the tank and its components before each use, especially if you have noticed any issues.

If you do spot any damage, it’s essential to address it sooner rather than later. A damaged unit can lead to unpleasant odours and messy spills, and repairing or replacing one can be costly.

Regular checks help identify potential problems early on so that you can take prompt action to ensure everything functions correctly.

Common Mistakes To Avoid And FAQs

– Avoid using harsh chemicals as this can damage the material and potentially harm the environment.

– It is recommended to clean it at least once a month or more frequently if you use it often.

– Do not use household cleaners on your wastemaster; stick to eco-friendly options.

– Overfilling it can lead to leaks and spills, so clear it out regularly and keep it from reaching full capacity.

– FAQs: Can I clean my toilet with the same solution? No, there are specific cleaning solutions designed for toilets that should be used instead.

Using Harsh Chemicals Or Overfilling

Using harsh chemicals or overfilling it can cause damage to the system. Harsh chemicals can corrode and weaken its materials, leading to leaks and other problems.

To avoid these issues, always use eco-friendly products. These are gentle enough not to damage the system while still being effective in removing dirt and grime.

Also, make sure to fill it appropriately when using it.

How Often Should I Clean It?

Experts recommend after every use or at least once a week if in constant use.

If you’re on a short trip, then maintaining it correctly after each trip is ideal.

It’s best not to wait until the tank is completely full because doing so can cause blockages and unpleasant odours. A good routine would be to empty the tank and rinse it with hot water before applying a disinfectant solution and scrubbing its interior surfaces.

Can I Use Household Cleaners?

While household cleaners may seem like a quick and convenient solution, they are not recommended. Harsh chemicals can damage the plastic material and even leave a residue that may affect the quality of water stored in it.

Instead, use eco-friendly products or make a solution using diluted bleach or hot water with a dishwasher tablet.

It’s important to note that using household cleaners harms the environment if disposed of improperly. So always opt for more natural options when available.

Additionally, ensure you always fill it appropriately, as this can cause leaks or other damage, leading to expensive repairs.


In conclusion, cleaning your wastemaster is essential to maintaining a healthy and hygienic environment. Following our simple steps, you can easily maintain it to prevent blockages and unpleasant odours.

Remember to use eco-friendly products and check for leaks or damage regularly to ensure a long-lasting disposal system. With the right care, your caravan’s plumbing will stay in top condition, giving you peace of mind during your travels.


1. What are some standard methods?

They include rinsing the tank with warm soapy water, using diluted bleach solutions to disinfect the tank, and using designated chemical cleaners specifically designed for waste tanks. Always follow manufacturer’s recommendations.

2. How often should I clean it?

After every use to prevent unwanted smells and bacteria from accumulating inside the tank.

3. Can I use household items like dishwasher detergent or bleach?

Materials such as dishwasher detergent or bleach are not advisable when cleansing your caravan’s waste system. These chemicals can damage your tank or cause other issues- it’s best to stick with a specialist caravan cleaner specifically designed for this purpose.

4. How do I maintain and store container after use?

After thoroughly washing it out, ensure it is completely dry before storing it in a cool, dark place between trips. Some owners even recommend adding mineral oil (baby oil) to coat the interior surface of their tanks, which helps protect them from cracking over time due to UV exposure – but always refer back to manufacturers’ instructions on appropriate care!

One product suggests : 

Specially formulated product suitable for cleaning Wastemaster and other grey water tanks, including Waste Hog, Waste Porter etc. Also ideal for cleaning waste pipe. One 250ml bottle makes 30 litres to thoroughly clean a Wastemaster or similar container twice.

To use, mix half the bottle with 15 litres of warm water, pour into the wastemaster and agitate well. Lay the wastemaster on its back and leave to soak for 6 hours (or overnight for a more thorough cleanse), then turn over and leave for a further 6 hours to ensure complete cleaning coverage. Empty the container, half fill with fresh water, agitate well, and drain.

*Last update on 2024-05-24 / Affiliate links / Images from Amazon Product Advertising API

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