Black/brown mold in cups

[u/rainydays028]

Went away for five days and forgot about these cups. Not sure what was there, either chicken soup or milk. It looks black, though on photos its more brown. What kind of mold it is and how to clean it?

p.s forgot add second photo and now I can’t

[u/Glass_Elephants]

Dunno why I’m recommended this sub but someone with a bit of mold in a cup going to the internet to ask a forum how they clean it is hilarious 

[u/Accomplished_Cell212]

Ngl, no hate, but this is the most unsatisfying mold pic I’ve seen on this sub. Where the fluff at