ashish, it's most of the time dirt but also sometimes fungus. same as in the basement of an house it is at our showers. black mold ( http://www.google.nl/search?hl=nl&su... ) is the bad mold (http://en.wikipedia.org/wiki/Black_mold ) on the other hand there also good mold --> Penicillium fungi on oranges or bread (http://en.wikipedia.org/wiki/Penicillin). but believe me ashish , fungi --- mold,no mushroom grows on such area.(in my old rent-appartement i had the same problems- try 90 % alcohol to desinfect the area or get some special product for it) fungi grows almost everywhere !! mushrooms not!!
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ashish, it's most of the time dirt but also sometimes fungus. same as in the basement of an house it is at our showers. black mold ( http://www.google.nl/search?hl=nl&su... ) is the bad mold (http://en.wikipedia.org/wiki/Black_mold ) on the other hand there also good mold --> Penicillium fungi on oranges or bread (http://en.wikipedia.org/wiki/Penicillin). but believe me ashish , fungi --- mold,no mushroom grows on such area.(in my old rent-appartement i had the same problems- try 90 % alcohol to desinfect the area or get some special product for it) fungi grows almost everywhere !! mushrooms not!!
Fungi do not grow on such area.
Might me dirt...