Mildew??

Lmao to funny, but on a serious note, I have a spot that looks similar, and no I didn’t do a random taste. The thing is I thought it was bird shit, but it’s been there for weeks after quite a few rain storms. Wonder what it could be.
 
Can't tell if that is PM but I'd remove the leaf just out of caution. And I rarely remove a single leaf.
 
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