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How do I permanently get rid of this discolouration in my bathtub? (I have hard water)
(sh.itjust.works)
I've tried scrubbing it several times with bar keepers friend soft cleanser and although it improves, it never goes away completely and it always comes back.
Where do you find citric acid? I've been using white vinegar in a jar in my dishwasher which gets rid of all water spots and cleans better with my hard water. However, I'd like to find a place to purchase citric acid crystals without relying on Amazon.
Citric acid is commonly used in the canning process. So look in the canning section of the grocery store. The last time I found it was at an ACE hardware that had a very good canning section.
Oxalic acid is an option for rust removal, but it is less common. Basically you need an acid that is safe for fiberglass tubs but works on rust. I have also used stuff like CLR or Lime-Away. Just double check that they are safe for the tub.
Just remember that even weak acids can be dangerous to work with. Wear gloves, eye protection and make sure the room is well vented.
barkeepers friend, which OP already tried, is oxalic acid
Interesting never used the stuff. I wonder what the concentration is?
Sorry, I got mine on Amazon.
Almost any store that sells general canning / food preservation supplies will have food grade citric acid crystals. If you're in a part of the world that has Walmart, Target, etc, then those types of places will usually have it. Grocery stores often have it. Sometimes it's considered a seasonal item and is only stocked during times of the year when people are doing lots of canning (i.e. spring through fall).