We have quite new white aluminium window frames inour new house but find that when previously decorated, the painter has gone over the edges of them in places - not a straight line - with the undercoat or top coat when painting the window sill a flat finish, possibly eggshell or satin finish wood paint. Is there any way I can get this off. It looks terrible. I had assumed our decorator would deal with it before painting but no such luck. Looks even worse now that we have nice white sills against these mucky blotches. Desparately need help. Afraid to use a paint stripper in case it takes the white surface of the windows off as well as this stray paint.