I love that product!Well, my cleaning today was not a decluttering, it was cleaning my bathtub. Since it's done, no point in before and after pictures.
The iron in our water stained the tub terribly. CLR (don't use that if you can't open windows) didn't really touch it. A neighbor recommended Bar Keepers Friend. $4 for a can. Way less than the $20 for the big jug of CLR.
WOW. OMG. What a difference. It took a lot of scrubbing and about 2 hours (some of that was sprinkle the stuff on and wait), but just wow.
We got an iron filter, so it should never get that bad again, but now I have a way to clean it.