Keeping things behind glass makes a world of difference in the dust problem too. I finally put all my displays in bookshelves with glass doors about 5 years ago and it’s amazing how much less dusting I have to do. I used to do major entire-collection-cleanings at least once or twice a year and it was a massive undertaking with tons of dust to be removed. Since I got the glass doors, I’ve dusted twice. Ever. And it was significantly less dust than even when I cleaned every six months before hand.
But outside of that, yeah, super ultra soft brushes and microfiber cloths (I use glasses cleaning supplies myself). For other (less delicate) types of figures like hasbro Star Wars stuff or vinyl Godzilla figures I use a synthetic fiber “feather” duster that uses static cling to catch the dust.