Probably not much you can do except let the chlorine (and time) break it down. Not sure how high you elevated your chlorine level, but you can easily take it up to about 10 ppm or so if you're not that high already. Keep us posted.
Eventually I'm sure it will. You're not the first TFP member to have stain get in the pool. Some people have had an entire gallon container fall in by accident. Just takes more chlorine and time.
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