Had a weird black stain on a PETG print. Maybe it was mold? It seemed pretty penetrated into material. Tried windex, all purpose cleaning spray, dawn soap and couldn’t get it out. Gave a tide pen a try and it scrubbed right out easily with that!
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PETG is actually pretty porous at the microscopic level which is why the stain was so stubborn - the Tide pen has strong surfactants that can penetrate those tiny spaces where regular cleaners cant reach.