
I mean they are very difficult to clean. After an entire toothbrush has been destroyed by repeated scrubbing and washing by hand, in the washing machine, and repeated cycles of LED curing, the piece still feels tacky. I've tried washing the part with water, tried the new 99.9% IPA, tried wire brushes, tried a toothbrush. The only thing that really helps to clean this resin is fine grit sandpaper.

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