I recently moved into a new home with an inground pool. There is a stain on the liner above the water level. I am assuming it is oil build up from suntan lotions? I have tried two vinyl pool liner products and have been scrubbing it using the a scotch brite pad. It is cleaning up very slowly. It took me about an hour to clean about 8' length about 4" high. I have had a pool before but never had a stain like this. Does anyone have any suggestions? Is there a product that anyone knows of that came get this out?