Perpetually blocking grey waste drain

Aug 23, 2011
772
738
NE England
Funster No
17,874
MH
Compass Avantgarde 140
Exp
5 years and learning
Our grey waste drain seems to block at the drop of a hat - I guess that basically it's undersized.

We've resolved to do all our greasy washing up at site facilities in future - we have tried wiping off as much grease as possible before washing from frying pans etc. but to no avail.

We have cleared the blockage before using a drain cleaner sachet (it's not completely blocked, just a trickle emerges) but having searched these forums I now realise one has to be careful what one uses to avoid damage. I've ordered a bottle of Fenwick's waste pipe and drain cleaner but I'm not sure this will be man enough to clear it.

Any recommendations?
 

Janine

LIFE MEMBER
Aug 22, 2007
7,718
12,520
A little bit left of Middle England
Funster No
142
MH
Autosleeper Nuevo
Exp
since 1988
Have you tried dismantling it where it joins the sink?

Mine has the most ridiculous shallow 'cup' below the plug-hole leading to a sharp right-angle outlet into the stupidly narrow pipe. This gets gunged up.

I don't use it any more. We have a small plastic trug that we either use to washup in the 'van or take to the facilities if there are any.
 
Apr 9, 2013
651
338
Ayr
Funster No
25,458
MH
A class
Exp
Newbie
For fat clogged domestic drains it's caustic soda that you want. I don't know if van drains are robust enough to tolerate the heat generated but as long as you follow the instructions I would have thought it would be okay.

Maybe someone who's used it can confirm?
 
Feb 16, 2013
11,999
15,310
uttoxeter
Funster No
24,713
MH
ambulance conversion
Exp
50 years
Well on here many times, although it seems unlikely people swear by coca cola down the plug hole keeps it sweet, we just use the bio washing liquid same as we put in the toilet
 

GJH

LIFE MEMBER
Aug 20, 2007
28,456
36,137
Acklam, Teesside, originally Glossop
Funster No
127
MH
Burstner t625 Harmony
Exp
Since 2006
Can't remember your layout Mike but if you have the fridge or oven under the sink the waste pipe may have some tight bends which restrict the flow. I use Buster Kitchen Sink Fresh ( or whatever it is called now) after every trip and that keeps things clean.
 
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