My kid scribbled on the wall with a felt-tip marker

First try the simplest fix, which will be least harmful to the wall, and then use tougher methods if that doesn’t work.
Wipe with a dry paper towel.
If the mark is still wet or the surface is smooth and nonporous, the paper towel may remove the mark.
If wiping with paper alone doesn’t do it, try moistening the towel with rubbing alcohol.
It’s still there? Go for the hard stuff—mineral spirits or kerosene.
These are flammable, so be careful.
They can also alter wall finishes, so test them first in an inconspic-uous area of the same surface.
Baby vomit on the carpet

Vomit is a protein-based stain, so avoid using warm or hot water, which can fix the stain in the fibers of a carpet.
First remove any solids using paper towels.
Next, spray the area with cold water and blot. Repeat until the stain is gone.
If residue remains, soak the accident site in an enzymatic cleaner, the kind you buy at pet stores to remove odors.
Wash and rinse according to product directions.
Someone got chewing gum on my carpet

Grab some ice, put it in a plastic bag (to prevent leaking), and rub the ice on the gum until the gum freezes and hardens.
Scrape away the hardened gum with a dull knife. If residue remains, remove it by blotting with a dry-cleaning solvent, such as Carbona.
Be sure to test the solvent first, however, in an inconspicuous spot to make sure that it won’t damage the carpet.
This procedure also works with upholstery.