What is the paint on: brick, wood, stucco, vinyl? Goof Off is your best bet, Acetone second. May need a stiff brush or even wire brush to final remove drips. Start gentle and work up to more aggressive techniques.
Acetone or mineral spirits to remove water based house paint?
Dont have access to goof off here. I've used it in the past for other things. Seems like it melted everything.