I just use boring old soap and water, although if the vinegar thing is a safe disinfectant, I'll give that a shot.
For what it's worth, I've had a number of Silent Spinners over the years, and have had fairly good experiences with them. Some of the problems that earlier incarnations of the wheel had (crappy, brittle plastic, too-small, tippy base) have been corrected. I've never had the yellow nut in back unscrew from a cage.
I have had problems with the yellow nut in front when the wheel's being used by a larger hedgehog, and/or the wheel starts to age. That nut in front needs to have a metal core in it so its threads don't get stripped. As it is, it's soft plastic, and the harder your wheel is run, and the chubbier the little guy or gal inside is, the faster the resultant vibrations will strip the nut and make it useless. That's when you have things like the nut popping off completely and the wheel falling off. (To the poor hedgehog, the effect must be like that "runaway mill wheel" scene in the second Pirates of the Caribbean movie.) I've glued a couple of those stupid yellow nuts on, since they're pretty much unnecessary anyway. A dab of glue can double the lifespan of a Silent Spinner.
At any rate, Silent Spinners seem to be okay for hedgies up to about a pound--or at least that's my experience. You still have to watch that central yellow nut when the wheel's seen 6-9 months of continual use, but I haven't found them to be bad overall.
As for the bowl shape that can collect poo, I either spot clean it with a damp paper towel or wash the whole thing out once a day. A full wash takes maybe 5 minutes. If I clean the thing often, I find the mess isn't bad. If I try to wait and only clean it on the weekend or something . . . eew.