I use oxyclean for a lot of things and it works especially well on fibers, including synthetics.

No risk of it degrading the material like bleach will.

Can help bleach out a stained tub too.

Also carpets.

*Be aware it can turn wood black tho. Depending on some features of some woods, it causes a chemical reaction that will turn the wood black. So be careful using near old wood floors/furniture.