In alt.callahans DerbyDad03 wrote:
On Nov 29, 3:03?pm, wrote:
quite a while ago, I saved the advice of some of you [in a.c.]
to use ?chemical sponges to clean soot, etc. from walls.

Have you tried a Mr. Clean Magic Eraser or one the generic store-brand
equivalents?

I have, and they don't do a thing.