Painting over crayon and chalk?

Is there a way you can paint over crayon and chalk on a wall?
If not, how can you remove them?

I want to paint my walls, but they are covered in crayon and chalk that has been there for years. The chalk does not seem to come out of the wall easily,...

and the crayon is so old that you literally have to scrub for 5 minutes for any improvement.

I found this...

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!

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

since you are going to repaint anyway, I guess I would sand the crayon and chalk off of the wall.