this post was submitted on 15 May 2024
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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.

close up picture of bathtub floor discolouration

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[–] [email protected] 11 points 4 months ago (2 children)

CLR usually works quite well for stuff like this. It's a spray cleaner. I think it stands for Calcium, Lime, Rust remover.

[–] [email protected] 16 points 4 months ago* (last edited 4 months ago)

Just a word of warning on this - I’ve had CLR ruin countertops and sinks by accidentally leaving it in contact with them for a long time, make sure you’re diligent about wiping up rings from containers and any drips - learn from my expensive mistakes!

Also test it in a hidden spot first to make sure it doesn’t dull the finish or something.

Edit: IMHO give the vinegar suggestion a go first, much less caustic

[–] [email protected] 1 points 4 months ago

I use CLR too (lots of tannin in my well water). Requires some elbow grease but works pretty good

[–] [email protected] 11 points 4 months ago (1 children)

I don't know how to fix your problem, but please post this image to one of the UFO communities.

[–] [email protected] 3 points 4 months ago

Oddly my thought as well. Lol

[–] [email protected] 10 points 4 months ago

Important question: What is your tub made out of?

Some cleaners may destroy it if you use them.

[–] [email protected] 9 points 4 months ago (1 children)

So it looks like ya got a couple of issues here. As the peeps mentioned, acid - weather in vinegar (preferably stonger like 30%+ if available) or chemicals to take off the lime deposits is a first start. Second it looks like the top layer(s) of the enamel are damaged and or cracked which is why you are struggling with it "coming back and not completely going away". There are fixes for this, but replacement is usually recommended if this is the case.

[–] [email protected] 3 points 4 months ago (1 children)

Thanks for the info, do you know what the fixes would be, short of replacing the tub?

[–] [email protected] 2 points 4 months ago* (last edited 4 months ago)

I'm far from a Profi in the field but I have looked into it before. There are companies that will do it either in home or take it to them, but often it is expensive. There are many home repair kits available, but the paint on / fingernail polish kinds work poorly. The sand the whole tub down and put a new layer on are better... But the cost and work typically don't justify it. If they are just top surface damages, you could try a higher polish sand job on the tub and see.

[–] [email protected] 6 points 4 months ago

I can't see anything, but I second vinegar.

Apparently the trick to cleaning is to use acids and bases where appropriate. Acid will work here afaik.

[–] [email protected] 5 points 4 months ago (1 children)

I'm curious as well, I have the same thing.

[–] [email protected] 1 points 4 months ago

I helped a friend with a bathtub that had similar stains , but it was almost black. I have a high grid polishing sponge for email, but it was too much, so i whipped out car polish and it worked.

[–] [email protected] 5 points 4 months ago

Honestly, have you tried magic erasers and some elbow grease? That’s usually my go to if regular subbing fails.

Best of luck!

[–] [email protected] 4 points 4 months ago (1 children)

Assuming that is an enameled tub. Try Bar Keeper's Friend (powdered not the liquid) dampen tub lightly and add a decent amount following up with a light scrubbing, letting the paste to sit for several minutes. It may need to be repeated or increased scrubbing. The slurry will probably require dampening it a bit to work it around. I find it removes iron and hard water stains. I have used toilet bowel cleaner but it is too harsh when cleaning the tub nekked! Like others have said, a water softener is the way to go. Our filtration system is currently offline waiting to be re-bed.

[–] [email protected] 1 points 4 months ago (1 children)

Since I tried the liquid soft cleanser, will the powder be enough of an improvement to warrant purchasing?

[–] [email protected] 1 points 4 months ago

For the 3 or 4 dollars I feel it is worth having on hand regardless. I use it quite often when cleaning pots and pans where Bon Ami doesn't do the job as well.

[–] [email protected] 2 points 4 months ago

Bar Keeper's friend will get that out, I use it when things get especially grimy. I've used it on a similar tub before that was pretty gnarly with discoloration worse than that.

It is very abrasive though, be careful not to scrub so hard you damage it.

[–] [email protected] 2 points 4 months ago (1 children)

I would think you would need a filtration system to soften your water or it will just keep coming back.

I’ve had luck with citric acid on removing scale, but be sure to test a small part of your tub before using any new product to be sure it won’t damage the finish.

[–] [email protected] 1 points 3 months ago

Unfortunately we do have a water softener but for some reason, there's still buildup.

I've been seeing improvements with powdered bar keepers friend but it takes several passes and still comes back unfortunately.

[–] [email protected] 1 points 4 months ago

Dunno if this will work, but white vinegar kills a lot of stains.

[–] [email protected] 1 points 4 months ago
[–] [email protected] 1 points 4 months ago (1 children)

Theres good advice on how to remove it here, but to keep it away you're probably going to need some sort of filter installed.

[–] [email protected] 1 points 4 months ago (1 children)

Bleach does the job for me. Add water and some bleach and let it stand for bit before wiping and rinsing.

[–] [email protected] 2 points 4 months ago (1 children)

And if that doesn't do it, try the trick I learned for cleaning the cutting boards at Subway. Lay down paper towel over stain, pour straight bleach on the paper. Let it stand overnight. The paper keeps the bleach in place and it won't dry as fast. A little harsh, but it works.

[–] [email protected] -1 points 4 months ago* (last edited 4 months ago) (3 children)

Haha, what? First, why does a cutting board need to be spotless? Second, no way you used bleach on this and then cut food to serve to customers... I hope. Anyway, good cleaning tip for non food handling items.

[–] [email protected] 5 points 4 months ago

Bleach can be rinsed away with water depending on the composition of the board.

[–] [email protected] 3 points 4 months ago

We had plastic cutting boards that covered the entire length of the counter that would become stained and dirty through the day despite being wiped down after almost every order. And since sanitization is vitally important at a restaurant, they needed to be cleaned somehow. The boards would be rinsed and wiped down every morning before use.

[–] [email protected] 1 points 3 months ago

A common way to wash many dishes is a tub of soapy water to clean off food, a tub of diluted bleach water to disinfect, and a tub of water to rinse the dishes. It's used by wilderness guides around the world.

[–] [email protected] 1 points 3 months ago (1 children)

Paste of Comet and peroxide

[–] [email protected] 1 points 3 months ago (1 children)

What does the peroxide add? Whitening?

[–] [email protected] 1 points 3 months ago

Yes the peroxide is a bleaching agent. Milder than chlorine bleach

[–] [email protected] 1 points 3 months ago

Mr. Clean magic eraser