Waterline cleaner?

Perpetual summer

Silver Supporter
Feb 17, 2017
290
Ohio
We had a few people over yesterday for a day of swimming. With all the sun screen, deodorant, hair products and whatever else, there is a somewhat oily buildup at the waterline and above. We have a fiberglass shell with no tile. Is there a product I can use to clean it off? I don't want to mess with pool chemistry. Is there something ready made up from store or something to make up that will work?