Help! How do I get stains out of Polyurethane gloves

Australia
February 7, 2007 3:14am CST
I have a pair of 'mighty grip' white polyurethane horse riding gloves. They have bright purple streaks on them, and I have no idea how to get them out. I have tried bleach, white-spirits, metholated spirits, scrubbing, detergent, a stain remover, the list goes on. Can anyone help me?
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