If the mildew problem is not bad it should just come off with regaular boat wash (soap). If it is impregnated into the vinyl I doubt you will remove it with anything. Like said above alot of cleaners are hard on the vinyl and the stitching. I if I have some that doesnt come of with routine washing you can try 409. That works well. Also I have another product called Mean Green that will work very good at removing most stubborn stains but I would wash it off as soon as you are satisfied with the outcome. THis is a concentrate though and I have not tried it on the seats.
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