I not sure who, but someone or many members suggested the use of OVEN CLEANER to remove layers of paint.One layer or a bunch.Well it works like a champ! I bought just a cheap OVEN CLEANER. I sprayed in on and let it set (length of time varies on how many layers )I wiped it off with rag or scotch pad. Clean off with soap and water.It removed five layers of paint from frame thats sixty years old . Thanks to all for these great ideas! Tom