I used this recipe on our walls, with a little Murphy’s Oil Soap added, and it did an excellent job of cleaning off the yellow smoke gunk. Wipe it on and let it set a minute or two, then I used some rinse water (although if you don’t smoke, you don’t really need to rinse) for best results!

1 gallon water, mixed with
1 cup ammonia
1/2 cup vinegar
1/4 cup baking soda