Staining

Modawg2k

Well-known member
May 4, 2013
338
Phoenix, AZ
#1
I was bad about maintaining my acrylic spa this winter. What can be used to remove this staining on both the shell and the fixtures?



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pooldv

Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
24,993
DFW, TX
#2
If that is rust then you can use an acid to remove it. Start with vinegar and move to diluted muriatic acid if you need more strength. Always add acid to water and never water to acid. 4 to 1 and move up as needed. Gloves and eye protection are always recommended.
 

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
14,488
Tucson, AZ
#3
I think ascorbic acid would be better. You don't want to hit already rusty metal with a strong acid. I think even CLR would be a better choice. Bar Keepers Friend liquid cleaner is excellent at removing rust stains from acrylic.

Go slow and easy and don't overdo it. As Danny said, use the least concentrated product you can, then step it up from there. After all is said and done, dump the spa water and start over.


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Modawg2k

Well-known member
May 4, 2013
338
Phoenix, AZ
#4
Thank you. Any thoughts to the best cleaner for the shell? I previously used diluted chlorine in the water but I don't know if that's the best for it.


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Swampwoman

TFP Expert
LifeTime Supporter
Apr 27, 2012
3,845
Grand Rapids, MI
#5
Also...is it possible to replace the rusty fixtures, or remove, grnd, refinish and seal?

If the steel fixtures are easy to remove, you might also try hub cap chrome cream...I've successfully removed rust from high gloss chrome mid-century furniture with same.
 

pooldv

Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
24,993
DFW, TX
#6
I think ascorbic acid would be better. You don't want to hit already rusty metal with a strong acid. I think even CLR would be a better choice. Bar Keepers Friend liquid cleaner is excellent at removing rust stains from acrylic.

Go slow and easy and don't overdo it. As Danny said, use the least concentrated product you can, then step it up from there. After all is said and done, dump the spa water and start over.


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Interesting, Bob and I were just discussing AA vs MA in PM. I'm losing 2 to 1. :)
 

Modawg2k

Well-known member
May 4, 2013
338
Phoenix, AZ
#7
I started last night with vinnegar. How long do you usually leave an acidic solution on the spot to treat? Should i be spraying it on and leaving for a couple hours, or spray and wiping right away?
 

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
14,488
Tucson, AZ
#8
I don't think vinegar is going to work well. It's acetic acid and it's a fairly weak acid / chelating agent. It's only good for calcium in my opinion and even then it's easily overwhelmed.

Try Bar Keepers Friend liquid cleaner. You apply it to a cloth or sponge and rub it on. Then rinse to clean.


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Modawg2k

Well-known member
May 4, 2013
338
Phoenix, AZ
#9
I don't think vinegar is going to work well. It's acetic acid and it's a fairly weak acid / chelating agent. It's only good for calcium in my opinion and even then it's easily overwhelmed.

Try Bar Keepers Friend liquid cleaner. You apply it to a cloth or sponge and rub it on. Then rinse to clean.


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A decent amount came off w/ the vinegar, but then again it could have been just the rubbing action. I still have tough spots to hit up so I'll look into that and the other products mentioned. Thank you