This is the BEST you will ever use!!! Suggested to me by n auto glass installer. Don't accept the fakes as their are many!!! I use it on spotted shower glass, RV CookTop, stainless sink and many more uses. I tried everything to get the spots off my back dark side windows and NOTHING worked until this. I also made my 40+ year old boat glass windows look new removing the caked on salt water residue.
SCAMAZON
Bio Clean Hard Water Stain Remover 40 oz. (20.3 oz.)
Visit the BioClean Store $14.99