I was wondering if anyone has a comment or feedback about the product called “The Step Stuff” by Jacks Magic? My stairs are not as white as they could be. I can take a Magic Eraser to them and the stains come off after a fair amount of effort. However, it is very difficult to remove the yellow/browning tinge on the treads of the stairs because they are not smooth (by design). Does anyone support The Step Stuff? It appears that product may do what I am hoping for? My water is balanced and clear, but either I have some sort of algae or they are turning color slightly over time? Thanks!