[JRTJH]

The "odorant" added is "Mercaptan". It's an oily, foul smelling substance that's used in both natural gas and in propane. Over time, some can settle out of the propane and build up in the bottom of propane tanks. As it flows through the regulators, under the right conditions, it can coat the regulator "internals" and cause them to "vibrate or to even fail".

I don't know of any way an RV owner can "clean the mercaptan residue" out of the regulators or the propane tanks. A "propane company or distributor" should have a repair/service shop that can clean the tanks if there is a problem with them, but when it comes to the regulators, it's probably cheaper to replace them than to pay someone to service them... I suppose regulators have become "one more item on the dispose/don't fix list"....

On a fifth wheel with tanks on opposite sides of the trailer, the "off side tank" will have a 30PSI stepdown regulator and the "primary side tank" will have the primary regulator that further reduces propane pressure to 11"WC which is about 0.37-0.4 PSI.