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. Black spots in rubber rim

  • 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 at 14:11

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.

  • Thanks for your response, let me try this – Co. Aden Oct 7 at 11:00
  • unfortunately it didn't worked – Co. Aden Oct 7 at 11:32

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