My grandmother made a quilt from my grandfather's old wool pants and shirts that he wore to work in the woods. She used the parts that weren't worn out and made the heaviest, warmest patchwork quilt with them. She has been gone for 37 years and that quilt has never been cleaned. Do I take it to a dry cleaner? I'm afraid to wash it not because I think it will fall apart, but because I'm afraid I will shrink and ruin it. She had just recovered the back of it with a thick cotton blanket before she died. Any help would be appreciated!