ID this fungus? And how to kill….

What you have there appears to be Nostoc. I don’t think there is a chem specific to kill it. It just grows in abnormally moist places / conditions. It will dry up and go away as the area dries.
 
It is Nostoc, it’s a pain in the butt. Had it on a range where I used to work. I forget the exact name of the product they used to kill it. But the article below has some listed.

 
It is Nostoc, it’s a pain in the butt. Had it on a range where I used to work. I forget the exact name of the product they used to kill it. But the article below has some listed.

Witches' Butter, I'll need to remember that.
 
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