I use iso alky on a cotton ball to clean the scanner all the time, too.
Dish soap is fine on vinyl records, but use distilled water. The "residue" is more likely to come from unfiltered tap water than soap. And let them air dry completely before re-sleeving them because they can and will grow moldy, especially if the records are put away wet with paper sleeves.
You don't need a fancy brush for cleaning the stylus, but a polyurethane gel pot is even easier to use (just dip the stylus tip in it), more thorough, and trivial to clean.
The only "fancy" vinyl accessories that've really provided a lot of value for me are a grounded anti-static brush: https://www.turntableneedles.com/grounded_carbon_fiber_lp_br...
And a cartridge/stylus upgrade, which for this setup probably doesn't need to be anything more than an $80 Ortofon Red and could easily be less. AFAICT this Pioneer has a replaceable cartridge.