There are grease-like marks in my book! Absorbing https://nuockhoangquanghanh.com/ by interleaving the book with paper towels and closing the guide. If that doesn't work, foods high in protein sprinkle the contents of a dry cleaning pad by the marks. With all your finger tips, very gently and lightly rub the information dust the particular page in the circular manner (DO NOT RUB WITH FINGERS IF PAGES ARE BRITTLE!). Allow sit for awhile, then brush dust away (Always brush away from the the gutter of course . to the edge). If ever the marks come from a pencil, erase them using a gum or plastic eraser. Stroke with the eraser in the forward motion towards the page rim. Brush away eraser dust and dirt very lightly with a soft tooth brush.