Years back I purchased this product from Home Depot. When I returned for more it was gone-no where to be found. We have hard water among other things and the boys cleaning the bath downstairs had been sloppy and we had build up that nothing would touch. I was soooooo excited to find this product again. Thank you. Now my son is getting to where he boasts of how shiney his sink is and checks to see if it's as shiney or shinier than mine.