Anyone in the market for the best RV black tank treatment is definitely in luck. This product offers extensive services on that front and others. So how on earth does the Thetford 24 oz RV Drain Valve Lubricant work? This formula is specifically designed to lubricate all sorts of waste treatment systems. So, the good news is that clogs and the sorts are no match for it. This liquid RV septic cleaner happens to be 100% biodegradable. It will equally do wonders on anything from a black to a grey water tank. Even more in terms of versatility, it is suitable to be used on boats and RVs alike. What it does is to coat the plumbing lines and as such, it guards against sticky valves. So, for anyone who has been having problems with waste evacuation altogether, this is a solid way out.