>I have been removing rust from all kinds of engine parts using a 5
>gallon bucket, a 1 amp battery charger (2 amp might be faster), a coat
>hanger, a stainless steel spoon or tongs (I tried rebar at first but it
>required cleaning too often), some small clamps, some water and some
>washing soda.  Pretty amazing how well this works.  Instead of writing
>all about it here, just do a browser search and you will find out how to
>do it.  I let things bubble away for 24-48 hrs...or longer.  I use a
>wire wheel to clean the parts afterwards.  Works great for the muffler
>support rods, and metal coolant pipes in the engine compartment. Ah
>science is amazing...  Just ask if you have any questions on my setup.
>Oh, BTW, a by-product of the reaction is hydrogen so watch for sparks
>and keep it in a well ventilated place. ;o)

I used concentrated nitric acid one, and it cleaned up some really
scabby rusty brake parts in minutes.

I thought it was conc acetic acid (which itself is very nasty stuff)
until I saw how it fizzed and gave off brown gas... the idiot
suppliers had sent me 3x20l bottles of nitric mislabeled as acetic!!
--
Andrew Grebneff
Dunedin
New Zealand
Fossil preparator
<andrew.grebneff@stonebow.otago.ac.nz>
Seashell, Macintosh, VW/Toyota van nut