What are these black spots in Plastic lids

Question

I have been using borosil lunch box from few months, Borosil lunch box

After few days of using it there are few black spots started generating at the plastic lid, I tried removing them using dishwashing soap and even trying to remove it by rubbing hard but nothing happened.
Could anybody tell me what is this deposit and how could I get rid of this.

Did you microwave that? It might be a fungus as the current answer suggests, but I wonder if it is imperfections/contamination in the plastic that reacted badly to being microwaved. Also, have you tried a diluted bleach cleaning? — UnhandledExcepSean, Oct 11 '18 at 14:11

score 3 · Answer 1 · answered Oct 07 '18 at 10:28

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It may be fungus. If so, soaking it in vinegar for about 15 minutes and then washing it as regular should do. The discoloration may not disappear completely, though.

answered Oct 07 '18 at 10:28

user18894

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unfortunately it didn't worked – Amit Bisht Oct 07 '18 at 11:32

score 0 · Answer 2 · answered Feb 05 '20 at 07:39

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This is mildew, a form of mold. The black stains it produces are practically impossible to remove from plastic objects.

answered Feb 05 '20 at 07:39

niels nielsen

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score 0 · Answer 3 · edited Aug 08 '23 at 19:07

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Use ammonia first then scrub with a brush.
Then try baking soda, scrub with a brush.
Lastly soak in bleach rinse with water while scrubbing with a brush.

edited Aug 08 '23 at 19:07

Glorfindel

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answered Aug 08 '23 at 01:14

Dsands

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What are these black spots in Plastic lids

3 Answers3