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It is possible to remove most oily or greasy stains from book pages. You will need some paper towels, a dry cleaning pad (available at drafting supply stores and most stationers) and a soft-bristled brush.
First, place paper towels between the affected pages. Close the book and weight it with another book of similar size, then leave it alone for a few hours. Discard the paper towels and examine the pages.
If there are still some stains, take the dry-cleaning pad and twist and squeeze it (or even cut a corner) to sprinkle the powder inside onto the stain. Cover the stain as completely as possible and leave the book lying open for a few hours. Brush the powder away with a soft brush. For very stubborn stains, rub the powder in VERY gently with a gauze pad, and let sit overnight.
Residual powder can be removed with a small hand vac. Vacuum from gutter to edge.