I posted a similar question (my horrible contractor tried to remove the sealer and blew it all into the pool, along with the acetone he used). The pool store suggested "First Aid for Pools" - only $20 so I thought it was worth a try. It worked like a charm - the oily slick was gone by the next day. My filter is gummed up, however, so I'm having the sand changed. You may need to do that too. Keep an eye on it, since you may have less stuff that got filtered.