How do I remove a line of heavy paint buildup on my wall?

by Dee
It looks like someone painted around "frames" of wood they build on the wall to simulate wainscoating, and left a heavy line of paint on the wall all around each "panel of waincoating". I tried a putty knife, but it's really tough and there's a lot as I have removed all the fake panels and I want to get back to a flat wall. Any thoughts?
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