I love KOH and am now after what feels like years on my second box. I have a black marble kitchen surface and KOH is the only thing that doesn’t steak it. I use it in my new shower which says so chemicals and do the mirror while I am up there. I clean the windows with it and the table, in fact everything except dog poo accidents as I am not sure it’s as good at killing 99% of germs as harsher cleaners. It certainly helps me to use less chemicals though and that is the whole point.