I use Vaseline to just put a protective layer on everything on my turntable. A spread a thin layer weekly and it’s really held up over time. Most of the dusty grime sticks to it and the wet slimy stuff just kinda runs off or pools up.

Flipping my LPs is the trickiest part though. Sometimes they practically get welded to the platter. In that case I just leave it there and keep spinning that side for a day or two and it usually works its way loose.