I print a lot of parts with supports into concave areas, and the parts are always masters for moulds, so cleaning support contact points for better surface finish is important, but for some parts it’s impossible with normal tools.
I’ve previously posted about how useful spoon knives can be, but they’re too chunky for many parts.
Recently though, I used a dremel grinding wheel to put edges on some old Micromark mini-scrapers, and now they are my go-to’s for tricky to reach contact points.
See video underneath pics for a little more info.
Shopping - out of stock for now, I think they were out of stock when I first found them, but they did come back…