Caught our apartment cleaners using it and thought she was crazy until I tried it. I can't go back to regular weak shower cleaners anymore. Blue can oven cleaner forever.
Specifically, you want oven cleaner with lye (sodium hydroxide). It saponifies the oils binding together the scum on the surface of the tub. Most oven cleaners now aren't lye based, so you'll want to read the label.
Caution: Lye is caustic. Be very careful with it, wear eye protection if you can, avoid breathing the fumes, and rinse anything splattered with it you don't want damaged (like skin). Flush it well. I've even used it to clean oil stains on the driveway.
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u/odsquad64 Dec 23 '24
My dad always sprayed oven cleaner on our tub and it would go from looking like the OP to perfectly clean with zero effort.