On 9 Sep 2004 14:17:09 -0700,
(nattydreadlocks) wrote:

can anyone tell me if potassium hydroxide is any good at removing
rust?

No, it's rubbish at it.

If you really need to remove rust from a cast iron block (rather than
oil, varnish, sludge, grot and the usual stuff) then look into
electrolysis.

NB - Make sure this block is a block, not an engine, and that's it's
all made of cast iron. A few bits of steel are OK, but one aluminium
casting left in place really isn't likely to survive most of the
cleaning processes.

--
Smert' spamionam