Not sure how often to clean, or what to use?
I use cozy n fresh pellets in my drop pan(equine pine pellets are great too, just make sure they’re kiln-dried)! I dump and clean the whole tray every week or two. You just need a thin layer since they expand when they absorb liquid, and they help with the smell. If your drop tray is inside the cage, you can use a layer of fleece, or just keep the tray bare instead.
I wipe down the cage a bit every couple of days, and deep clean about every 2-3 weeks. A lot of people use just soap/water or vinegar/water, but there are better alternatives. I'll link two really great cleaners(these are affiliate links). Chlorhexidine is what vets use to clean kennels and such, it'll need to be diluted 2 tablespoons to a gallon. The peroxide spray is often used in hospitals. They're both awesome at cleaning and getting rid of the smell. I spray the cage down with one(whichever I happen to have), let it sit for 10 minutes, then scrub and wipe clean with a wet rag.
I usually use my regular detergent, a cup of vinegar and sometimes a teaspoon of chlorhexidine. I wash in warm/hot water, then dry on low/no heat in the dryer(be sure not to dry too hot, as it can singe the fleece). You can air dry them too. You can use unscented detergent or a bit of regular detergent too(nothing too strong). No fabric softeners or dryer sheets.
I soak toys and wheels in the sink with hot water/vinegar/dish soap . After a few minutes, I scrub them with a rag, rinse, spray on some chlorhexidine solution or peroxide spray, let it sit for 10 minutes, then rinse again and dry.