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My personal rule of thumb is that you have to be just as careful with what you put down an RV drain as with what you put in your body. Whether in the sink or the commode, only materials or products that an RV drain system specifically is made to handle should be used.
RVing Al warned against using any corrosive drain cleaners such as original Drano in the plumbing of an RV. Not because of the possibility of it damaging your RV's pipes, but because it could also damage the rubber seals on the dump valves or even the holding tanks themselves.
He made mention of another widely used product for stick and brick homes: RID-X. In the Q&A section of the RID-X website it says "Q: Can RID-X® be used with Recreational Vehicles (RVs)? RID-X® has not been tested on recreational vehicles (RVs). therefore we cannot recommend using it in RVs." So the answer is no again.
These are his recommended practices on how to unclog and prevent clogs in RV plumbing. A lot of these suggestions come from other RVers and I have not tried all of them personally.
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1. You can use an enzyme based drain opener such as Drainbo Drain Cleaner which can safely be used in RV drains.
2. You can also dump boiling water down the drain to help break up the clog. You may have to repeat the boiling water process several times to totally free up the clog.
3. You may also want to try dumping 3 tablespoons of baking soda down the drain and then dump about a 1 1/2 cups of vinegar in the drain and let it sit for a couple of hours and then use boiling water to rinse out the drain. Remember those elementary school science fair projects with vinegar and baking soda: instant volcano! That sounds like an effective way to break up a clog.
4. If all else fails you may have to remove the P-Trap (elbow under sink) and manually clean it out. This is not as complicated as it sounds.