Almost all RV kitchen stinks are double-bowl sinks with the two bowls connected together with what is called a continuous waste. There is a good amount of pipe between the trap and the strainers in the bowls. These sections of pipe, especially when they have very little slope, are subject to bacterial growth which can really stink when the scum and bacteria begin to build up in them. I’m a plumber, so I deal with this smell problem for customers several times per month. Depending on how the continuous waste is installed, I will either take it apart and clean it all out or I will just install a new one. I prefer to install new ones because it is a really nasty job cleaning them out most of the time. Every RV continuous waste I have seen is very simple and put together using 1-1/2” CTS slip joint pipe and fittings.
This isn’t something you can just take care of by pouring something down the drain — you must take it apart and clean it out or replace it.
I pay about $8.00 at the supply house for a complete 1-1/2” CTS slip joint polyethylene continuous waste.
2016 Rockwood Windjammer 3029W Diamond
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW