i like CLR for cleaning the tub . short story , have a rental were the gent pass away , the widow that the family over . they wanted me to replace the tub . why i said ? , they replied . its dirty and it won't come clean . so i say , let me try . so a sent an afternoon cleaning it with CLR and a scrub pad . when i finished . they were in aw ! chrome gleaming , glass doors you could see through , the tub sparkled white again . they all came to me , ''thank you so very much '' what did you use ? i said CLR n a scrub pad . they all noted it down on their tablets . i have rentals and it the only way to fly through the bathrooms . but sadly no hot younger chicks want to get me a good time for it . lol !