I find that Warm and Natural stinks when it is wet or damp. When I wash my quilts that have it as batting, I have to make sure it dries completely before they get used again. I prefer to dry on a clothes line.
I also use W&N as my base on my large cutting table, to iron yardage and find if I use steam, I can get that smell again, so water makes something react and smell.
Other than that, I love it.
Diane