White parts in Resin Tank

Does anyone know how to remove these white bits on the side of the resin tank, it’s pretty solid. It’s coming off during the grow and sticking to the models. Also what is it and how can we avoid it???

??

Do you have a lot of print failures? If a print fails then there may be particles of cured resin in the tank that need to be filtered out. Also, if you expose the resin to sunlight then some of it will cure, it looks like you have the cover open in a location with sunlight and it will likely start curing.

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