If you don't have the black tank flush on your unit, get one of the tank flush wands and use that to prevent/remove buildup.
I bought a camper once that I later found had lot of solids in it, it was a bit of a pain to clean out. I filled it with water, let it sit for 3 days then dumped it. I had access to a pasture that had some woodchuck holes so I could get away with dumping at my leisure. I made my own wand with an old piece of water hose and a piece of copper pipe. Closed of one end of the pipe and drilled a hole in the side of it near the closed off end, attached the hose to the other end and clamped it on. Stuck that down the toiled and started blasting water in while turning and tilting the wand to flush out what remained. It took a little while but it did the job.
2020 Coachmen Mirada Select 37RB
2020 Ford Ranger
EZGo Freedom TXT Golf cart