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I have a cheap tool with some rust on it. It's probably cheaper to buy a new one than to clean it. But I wonder if is there any solution where I can drop it and retrieve it clean. Is there anything like a rust solvent?

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Coca-Cola works too, and is a fun experiment. :-) ehow.com/how_5133333_remove-rust-cocacola.html –  Abhi Beckert Oct 20 '12 at 23:31
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6 Answers

up vote 2 down vote accepted

Perhaps naval jelly would (Phosphoric acid) do the trick? Or maybe electrolysis…

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This stuff is sick: http://www.evaporust.com/

I used it on a drill press my buddy left out on a patio in the rain for a year. Virtually no scrubbing. I don't understand how this is not one of the most widely known products in the world. It is THAT good. I guess with the military as a client, they don't need the business from the public. Here are some pics. Truly an amazing product. I purchased a gallon of it at a Harbor Freight store for $20.

Before:

enter image description here

After:

enter image description here

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I use CLR for that sort of thing. The main purpose in my house is for hardwater scale, which accumulates on everything, but it also works on rust. Handle with care, it is wicked strong.

CLR

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In Brazil we have Semorin - Tira Ferrugem (rust remover)

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SUPER EASY!!! Get a cheap nail brush (but a big one for use on feet is better, if you're willing to sacrifice it), toss your tools in a tall cup of baking soda (don't measure, dump in as much as you think you need and a little more) with some water. Take out one piece at a time and go to town scrubbing on top of a good hand towel. Keep going until it's as clean as you need it to be.

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If you have a significant other, doing this on the good hand towels will get you in lots of trouble. I'd recommend an old rag. –  BMitch Oct 21 '12 at 11:51
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It used to be that pepsi and/or coke would eat away rust - not sure if the newer formulations will still to that, though. You could also try some vinegar.

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coke was a myth - i tried it with several cokes type in 3 countries. Even mythbusters mythed it. Coke is bad for your teeth because they used to use RO water, which striped calcium (Tooth = Calcium) Now they use mineral water... –  ppumkin Aug 4 '11 at 16:32
    
#ppumkin - did not know that. I did find both snopes.com/cokelore/acid.asp and ehow.com/how_5133333_remove-rust-cocacola.html, though personally I'd go with naval jelly or a sand blaster. –  chris Aug 4 '11 at 19:20
    
Yea - i went thorugh many of those sites. Its not true :( a bit of a read- but maybe worth it - pkula.blogspot.com/2010/05/… - PS - In the motor industry the scret to remove rust is........ pool acid (hydro-chloric acid) work slower than industrial (beware-it eats skin!) after usuge though you need to chrome-or paint it. or it will come back- duh?! Also very good for getting rid of moss/lime/mildew of cement/bricks. etc.. not populaor because its slighlty hazadrous- but works a mint! –  ppumkin Aug 4 '11 at 21:16
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