noticed green fusy spots on the walls in my 2 car garage have green fuzy spots

It sounds like mold to me. I'd mix a solution of soap and bleach and scrub the walls down with a short bristle brush asap. Mold can be a lot of trouble. You probably have quite a bit of moisture. You might want to do something about that.
 
,mold,put a dehumidifier in,wash the spots with bleace water,even just a fan would get rid of it.
 
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