I recently came by a quilt that is past the point of dirty and really, really needs to be washed. I would like to try to save it if possible but I do not know if it has ever been washed before. I think it may have colors that fade. It is my undestanding that I can wash it in vinigar and it will set the colors and keep them from running. Will this also set the filth? Do I wash it in vinigar before I wash it with Woolight or something made for delicate fabric or do I wash it using both vingar and Woolite at the same time? How much vinigar would I use? Or, is there a product that would work better than vinagar. Thank you for your help.