Which grey/waste tank cleaner - votes please (15 Viewers)

[leobliss2025]

Which is your favourite product and why?

 

[pappajohn]

Cheap cola is a favourite.
Couple of 2L bottles, go for a drive to agitate then empty out

 

[leobliss2025]

Cheap cola is a favourite.
Couple of 2L bottles, go for a drive to agitate then empty out

Well I wouldn’t have thought of that!

 

[Two on Tour]

Same here, cheap cola.

We bought a PVC some years back and the grey waste was very slow to drain even with the aid of a stick pushed up the drain tap to try and clear the grot, so I poured in 6 litres of cheap Aldi cola and went for a bumpy and wobbley ride around the country lanes for ten miles or so, and then drained the grey tank down the next morning. Verdict, yes cheap cola does work and a pretty impressive job at that.

 

[Rob Turner]

Rola Cola

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[Gellyneck]

Same here, cheap cola.

We bought a PVC some years back and the grey waste was very slow to drain even with the aid of a stick pushed up the drain tap to try and clear the grot, so I poured in 6 litres of cheap Aldi cola and went for a bumpy and wobbley ride around the country lanes for ten miles or so, and then drained the grey tank down the next morning. Verdict, yes cheap cola does work and a pretty impressive job at that.

View attachment 918006

I would have used a finer filter than that before putting it in the Bacardi though!

 

[leobliss2025]

I would have used a finer filter than that before putting it in the Bacardi though!

 

[hja]

We use Fenwicks tank cleaner, but only about once a year

 

[Guigsy]

Puriclean. Clean the fresh tank. Then run it though the taps into the grey and leave it there overnight. Two for the price of one.

 

[Bobby-gg]

We've never tried the cheap cola because I always thought that it would leave everything sticky inside!

I've owned my pvc since 2019, and twice I've dropped the tank off and pressure washed it out, once upon first purchasing, and last winter getting it ready for our 3 month tour of Europe.

In Italy a month ago, in the red hot heat, and having not moved for 7 days we had a horrible stink coming from the waste tank, even though we'd hardly used any water, so hardly any gone down, talking to a German neighbour, who could probably smell it too, he recommended a small solution of toilet fluid after dumping, which we've done regularly since and had no more smells

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[rolosroller]

 

[Badknee]

Rola Cola

Ah, a Peter Kay fan

 

[Diabalo]

Cheap Bio washing powder/liquid

 

[gus-lopez]

 

[Richard n Ann]

I always put hot water and a couple of crushed dish washing tabs in is as we are about to set off, the drive agitatess the water and cleans the tank perfectly... Just have a sick bag ready for when you open the drain

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[Lenny HB]

Dishwasher tablet works for us.

 

[BouncyBoatFolk]

Not diet cola though.
An alternative is Citric acid, in the spring, heat the solution in the on-board boiler letting work it in there for a couple hours, and then running it through the pipework, pumping it down to the grey tank and then go for a drive. Drain it off the next morning. Double use of one product.
I sometimes do it just before we're due away, and let the liquid slosh about in the tank till we get to our destination, dumping it then as we take on more water.
Mike.

 

[Hedgewitch]

Richard n Ann , Lenny HB

I try to wipe all plates and pots with kitchen paper before they go near the sink so that "bits" don't get into the tank in the first place.
Couple of disher tablets crushed into hot water, and then a few miles on twisty roads Works really well in the toilet cassette as well.

 

[Lizbiebrowne]

I went the opposite way down the pH scale and used warm washing soda. it came out quite brown so it must have done something. The level sensor now reads both 25% and 50% whereas before it only read 25% but still doesn't reach 75% or 100%.

 

[activecampers]

The branded thetford stuff is the only stuff that stops any rancid smell.
We've tried every option, coke, washing power, but the smell can still be awful when empting.
Its not a huge expense, a small amount capful every few tanks, and no smell when emptying. We use less than the recommended dose.

(We have traps so never have internal smells, but I don't like leaving a stink bomb at disposal points - though seems I'm in the minority on this! Mines electric dump too so I don't even need to be near it, but still.....)

https://amzn.to/4cpJyCi

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[Tigger-Tim]

I crumble a dishwasher cleaner tablet in hot water. Not a regular dishwasher tablet. https://www.amazon.co.uk/dp/B07M7P14NF?tag=mhf04-21

 

[Purrfecttune]

Richard n Ann , Lenny HB

I try to wipe all plates and pots with kitchen paper before they go near the sink so that "bits" don't get into the tank in the first place.
Couple of disher tablets crushed into hot water, and then a few miles on twisty roads Works really well in the toilet cassette as well.

In four years of Motorhoming we have also always used kitchen roll to wipe pots, pans, plates, cutlery etc prior to washing up. We consider it good practice to avoid blockages.

 

[Nanniemate]

Which is your favourite product and why?

Milton fluid or bicarbonate soda and vinigare

 

[kev54]

Which is your favourite product and why?

White vinegar. Cheaper than chips (certainly in France) and no smell or sugar. Pop a litre down the drains now and again. Drive around, then dump (in a designated drain of course). At the end of each big trip, a couple of litres in the main tank and run through the boiler and pump and aftwards run a half tank of clean water. No smells, no calcification.

 

[leobliss2025]

White vinegar. Cheaper than chips (certainly in France) and no smell or sugar. Pop a litre down the drains now and again. Drive around, then dump (in a designated drain of course). At the end of each big trip, a couple of litres in the main tank and run through the boiler and pump and aftwards run a half tank of clean water. No smells, no calcification.

Really smart idea.

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[Happy Jim]

I had the stinkiest grey waste ever, had it for years! Chucked in half a bottle of the green loo fluid, drove 200 Miles (1/4 full to slosh) and left it for 2 weeks - drained the tank and zero stink! Was (and remain) very impressed

Jim

 

[leobliss2025]

The branded thetford stuff is the only stuff that stops any rancid smell.
We've tried every option, coke, washing power, but the smell can still be awful when empting.
Its not a huge expense, a small amount capful every few tanks, and no smell when emptying. We use less than the recommended dose.

(We have traps so never have internal smells, but I don't like leaving a stink bomb at disposal points - though seems I'm in the minority on this! Mines electric dump too so I don't even need to be near it, but still.....)

https://amzn.to/4cpJyCi

Thanks for this advice. These chemicals are so expensive and it’s good to hear a solid recommendation.

 

[Smudger55]

I've recently bought and used this to good effect:

Pro-Kleen Intense Waste Pipe and... https://www.amazon.co.uk/dp/B07FTD9V9S?tag=mhf04-21

 

[Wombles]

A splash of Solbio https://www.motorhomefun.co.uk/forum/threads/solbio-eco-toilet-waste-water-treatment.273365/ down the plugholes keeps the nasty niffs away when in use. Also once the grey waste tank is emptied on leaving a campsite we run some water & Solbio (just a splash) down all the plugholes then it gets jiggled all around the grey waste tank on the way home - it can be a bit frothy to empty then (if too much Solbio is used) but clean for the next trip.
Using a bowl for washing up, using Ecover washing up liquid & trying to avoid pouring washing up water, pasta water or anything with food debris down the sink drain are tips that we learnt from this forum early on

 

[Southend]

We use Puri Sol. I add Puri Sol to the fresh tank about once every 6 months, go for a drive, leave for 24 hours then drain through all the taps and shower and repeat the drive and 24 hour soak before draining the grey tank.

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