ANSWERS: 1
  • It may be mold. You can use bleach...but be careful. Bleach is actually a very dangerous chemical. Make sure children and pets are far away (and locked out). Be sure to have adequate ventilation when using bleach. (The fumes are also harmful.) Bleach is caustic so also wear gloves and safety glasses. If the black stuff is mold, then it should disappear shortly after the bleach hits it. Don't forget to rinse the bleached area well and don't mix chemicals. :D

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