I'd retire them. I don't own any UR3 toys, but I'd like to someday, just to check out the material. I know they aren't known for safety and longevity, but I'm still curious.
If you are looking for a softer more realistic texture but in a material that's safer, check out the Vixskin Silicone by Vixen Creations. It's ah-may-zing. It costs a bit more, but it's totally worth it.