Do they need repairs or just dirty? Retro Clean is a product for antique stained textiles. If they need repair, that should be done before washing. If they are too disgusting to repair first, hand stitch netting over the bad spots to prevent further damage. Put a sheet in the tub to aid in lifting the wet quilt out of the tub, and hand agitate with the soap to clean the quilt.
if they are true antique quilts, have them evaluated by a antique conservator before doing anything.