another thing that might work is unscented cat litter. put some litter in a shallow pan. put the squares in a pillowcase, or muslin bag, spreading them out in flat stacks. fold it closed, put that in the pan, and then "bury" in in more litter. leave it for a couple of days, and then toss the litter. repeat the process until all of the squares have had a chance to "air" near the largest concentration of clean litter. (i've used this trick with papers, books, and magazines, as well. they are porous, and soak up any smell they're near, just like fabric.)