What can I do to keep my walls looking clean?

Mammas. I live in an apartment with terrible paint!!! It literally stains with water… but it’s driving me nuts. I have three kids and two pets and no matter how hard I clean them they’re just a mess! Obviously probably not to other people but I know it what are you using to clean your walls??? I’ve been using a sponge mop and Mrs.Meyers multipurpose cleaner.

Magic erasers work awesome. Iv also painted the walls with semi gloss paint so it’s easier to wipe off than the cheap flat paint they had in this house lol.