Kurt, or anybody.
What is the best way to handle/clean a sheet that my brother found on top of his gas tank just this weekend (72 LA SS Nova)? it is very brittle and is covered with 40 yrs. of fine black soot. Im not going to a document restorer as it is not mine and he can care less about it. It seems even a weak vacuum with a brush would damage it further. It is currently between pages of the Sunday paper for safe keeping.
Thank's for any advise,
Hopefully, your Sunday newspaper is printed on acid free paper.
If nothing else, make copies and then put the original in a suitable-sized clear plastic slip. You can find them at antique stores. Then, keep it in a slightly cool, dark place.
I've got two British propaganda booklets from WWI that were stored in a linen closet until the 1990s, when I got them and stored them as I said. They look brand new....
I doubt that cleaning it would be profitable as you describe it. Anything that would impact the black soot (mold?) would hurt the paper.