On Mon, 29 Oct 2007 15:12:54 -0400, "Reginald P. Smithers III"
wrote:

Cheap enough to experiment with.
15% hydrochloric acid by weight.
http://www.ahprokleen.com/products/msds/MSDS110.pdf


Yes, take a close look at the label for "On and Off".

JimH prefers using abrasive powders.

Actually, in Jim's defense, he said that he did not rub out the stains
with Bar Keeper's Friend, just makes a paste of it and lets the acid
do the work. In my opinion that will not harm the finish although
something like "On and Off" or "Sno Bowl" will probably get the job
done quicker. All acids are potentially harmful to people or paint of
course. It makes no difference if they start out as a powder or a
liquid.