Understood. That's a tough one, clean plumbing or body. I'm actually about to get a fifth wheel to keep permanently parked at a Lake about an hour from home, as I had leaving my Newmar up there during the week when I go home, with storms and stuff that could mess it up.Crude build up in faucets hard residue in toilet which is difficult to scrub away. No room to carry both.
I'm wrestling with what to do, including the fact filters and filtered water (if chlorine has been removed) tend to get real nasty when they sit in the heat with no water movement.
Clean water in these rigs, especially when you use them infrequently, and with limited space, is a pain.