Lovely, I have washed in cold water on delicate cycle then line dried several old quilt tops. First I do all the mending and stablize the top so that nothing frays.
One of the fun things at garage sales, auctions and flea markets is finding old quilt tops that need saving. Also find a stash of old quilt blocks now and then and do the same thing, just put them in a mesh laundry bag before washing. Good Luck!