My new rashguard stained my gym's mats..

Nope, you shouldn't have to wash it first.

That sounds like a ridiculously badly produced product, did it color you too?
 
That sucks. Reminds me of a time when I wore a cheap pair of ble underpants, in my white gi. The gi pants are still blue from those underpants. My skin was stained also.
 
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