I would ask the coordinator how you should handle it. Maybe they will just want to tie the quilts and then wash them. We once came home from vacation to a dog with fleas (thanks to our son who took him unknowingly to a friend's home who had cats with fleas
). I was a fanatic washing everything in site. I had a quilt top, made with Moda fabric, and I washed it in with hot water on delicate and dried on low. It came out great with some unraveling but no seams pulled apart. Was easily able to iron it. But thinking about it, I had pre washed the fabrics on hot with Retayne so the shrinkage had already occurred. Good luck. I couldn't stand the smell of mold/mildew so I'd probably refuse to do it.