Cotton, linen, white fabrics will respond to bleach and hot water well, they are hydrophyllic fibers-take on water from the inside and out. Synthetic fibers and fabrics are hydrophobic, they are made of oil/resin/chemical based things, not plants & animals, and once they dull, they dull, and do so with exposure to the atmosphere and heat, from the outside in. Look at how old plastic white things yellow. Blends are tricky, but will bleach out somewhat. Fabrics are classified as follows: 1.)Natural Fibers:linen,cotton,wool,cashmere,ramie,silk. 2.) Man Made(synthetic)Fibers

olyester,dacron,acrylic. 3.) Blends: Natural and Made fibers like cotton/poly, wool/acrylic, linen/silk. They should be treated like sythetics, as should "wrinkle free" things. 4.)Man Made Natural Fibers: Rayon-it is made from wood pulp and then made into fibers, so it is hydrohphyllic(loves water) but hates bleach due to the pulp resins,so it should be treated as a synthetic. It is a cooler fabric to wear however because it wicks water away from the body a hell of a lot better than polyester. Did you know that the "wrinkle free" tretments in clothing contain femldohyde? Use the low heat setting for these as you want them to last as long as you do when embalmed.