Other filament stuck in the nozzle maybe, and it just came loose in your print? I cant imagine mold being an issue.
It's an old piece and in the kitchen.
Ah, that makes more sense.
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.
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