You definetly dont want to bleach them. That will leave a chemical residue on the towels and do a good job of scratching the paint up next you use them. If they are that bad,you should think about retiring them and go out and buy new ones. 100% cotton white "name brand" terry cloth towels that are made in the USA is what you should use. You should also make it a habit of washing your towels right after you use them so the junk of them doesnt have much time to set(usually within 12 hours). You should use All Free Clear (no added dyes or perfumes) liquid detergent and run them through the rinse cycle twice to make sure their is no leftover residue. There is more info on this site:Zaino Bros.
If you havent already been using this stuff,I highly recommend it. Its the only stuff I use.
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