DH has a memory foam pillow. It’s in a zip-up allergy-fighting pillowcase, and then in another pillowcase. But it still leaches vile yellow colour that stains the white pillowcases and makes it look as if he’s dribbling something revolting. Or doubly incontinent. 
I’m soaking the cases in bleach but does anyone else have this problem and have they found a solution to it?