Shower tray not draining- Advice needed

[V1nny]

I have been getting our Motorhome ready for a very brief second trip out since lockdown. The last time we used it was for a few days last August. While cleaning the shower tray this afternoon I found it isn’t draining.

I have tried a flexible brush which is like a tiny brush on the end of a wire about 5 feet long and although I can get it down the pipe it still doesn’t drain away.

If it was in the house I would try a plunger, bleach, Mr Muscle drain cleaner or a combination of all three. but I don’t know if these methods could damage the plumbing in the Motorhome? Can anyone offer any advice please? I’m not the best with DIY and I’m worried I could make the problem much worse if I try the wrong thing.

 

[Mr and Mrs Tupcox]

Is van sloping wrong way as if its like our van no fall on pipe to waste tank.
Also our has no trap so getting blocked is strange.

 

[V1nny]

Is van sloping wrong way as if its like our van no fall on pipe to waste tank.
Also our has no trap so getting blocked is strange.

Whatever it was, it’s gone now.

 

[Vanterrier]

For future reference, if you have a blockage and don't want to use aggressive bleach etc then pour cheap coke down the plug hole. Its about 17p for a big bottle from Aldi/Lidl and that works fine.
Don't forget to flush it out with clean warm water once the blockage clears.
K

 

[Mr and Mrs Tupcox]

Whatever it was, it’s gone now.

One of them motorhome ghost.lol

 

[Obanboy666]

My recently sold Pilote shower tray frequently started to drain slowly. Used a plunger everytime and it always sorted the problem out..