I have this beautiful hand sewn quilt top that I found in my mom's things when I was packing up her house. There are stains on it that I don't know how to remove. I used one product, Spoto spot and stain remover, and ended up with a hole where the stain had been! I don't know the age of the quilt but I am guessing 50 plus years. A woman I talked to that was shopping for material like I was said that old quilts can get mildewed. Any ideas?