I know that myself and many others have had questions on how to best clean white resin parts. The inside of my white resin mask has been stained with blue and purple hair dye for like a year. So every time I wore the thing my face would turn a slight shade of blue. The problem with cleaning places like this is any product strong enough to remove permanent/semi permanent hair dye from the inside of my fursuit head would probably mean possible damage to the fur or at least the buckram eyes. Back about 6 months ago I did a refurb of my fursuit head and did a complete submerge, replaced the buckram eyes and took a crack at getting the blue hair dye off my mask with all sorts of products that I would consider safe for fabric (teddy bear cleaner, folex, regular soap and water, detergent) and nothing would remove the stains. I have found the solution. Then my BJD friend was like LOL MR CLEAN MAGIC ERASER. It's magic. Wiped off the dye like no joke.