1. Toothpaste (regular paste?not gel). This one?s my first pick always (good old regular Crest), it also helps clean up permanent marker stains pretty easily.
2. Artgum Eraser ? gently rub on marks in a circular motion, can also try a regular pencil eraser. Done carefully, this might be an option for wallpaper stains.
3. Baking Soda ? make a paste with water and use it to gently scrub the mark. You could also just sprinkle baking soda on a damp sponge and rub.
4. Baby Oil ? apply directly to crayon stains then rub off.
5. Mayonnaise ? Glob some on the stain and scrub a bit in a circular motion, then wipe off.
6. Shaving Cream ? apply to markings, rub in, then wipe off.
7. WD-40 ? spray some on the marks and rub off. Wash walls with hot soapy water once the crayon has been removed.
8. Turpentine ? dab some on a damp cloth and scrub into stain to remove crayon.
9. Lighter Fluid ? apply as you would turpentine
10. Goo Gone ? Same directions as for turpentine
11. Ammonia ? soak a section of cloth in household ammonia and scrub markings. You may also luck out with an ammonia based cleaner like Windex and a hot soapy cloth.
12. Vinegar ? soak a toothbrush in white vinegar and scrub marks off.
13. Heat ? Take a hair dryer to the crayon stain and allow it to heat the wax. Wipe heated crayon wax off with a hot, soapy cloth. You could try a clothes iron as well (no steam), just make sure it?s on a low heat setting so it won?t scorch the paint. Place a few paper towels between the wall and the iron.
14. Hand Lotion ? rub directly into crayon and wipe off.
15. Powdered Dishwasher Detergent ? make a paste with water and gently scrub area. Some detergents contain bleach so be careful on wallpaper.
16. Powdered Household Cleaners ? such as Ajax or Comet. Mix with some water or sprinkle on a damp sponge then scrub gently.
17. Non-stick Cooking Spray ? just spray it on then wipe off the marks. Not the best solution for wallpaper since this could leave a grease stain.
18. Hairspray ? spray generously on walls then scrub off the crayon.
19. Mr. Clean Magic Eraser ? go gently, you don?t want to rub off any paint.
20. Rubbing Alcohol ? Saturate part of a clean cloth then rub stains.
21. Moist Baby Wipe Towelettes ? Rub them directly on the crayon stains and scrub markings off. The homemade baby wipes should work too!

Site reference http://tipnut.com/21-crayon-busters-how-to-remove-crayon-from-walls/

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I’m so sorry that this blog has not updated for a while owing to time limitation. I am very busy at the moment with my project. However, I’ll try to put something useful for others.