I had similar issues once, due to too much household TP use by a guest who insisted on smuggling the good stuff out to the trailer vs using that which was there.
Ever since then a couple of times a year; I dump a bag or two of ice cubes in via the toilet to just a few gallons of water, let that swish all around for the drive to the campground and do a full septic dump on the way into the site while everything is all still freshly agitated.
Same as dish washing, the ice cubes do wonders scrubbing and save you a lot of effort. Try a few ice cubes in a plastic container that had chili or pasta sauce with a bit of dish soap, giving the container a couple of shakes and see the difference.
As most others have said; let the tank build up, not drain.
Maybe it is just learning after the experience, but ever since I started doing this, I haven't had any issues.
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