I clean it very often, and I deep clean my room (and bathroom) about once a month. Usually when my rooms messy its because it's unorganized (like I have clothes on the ground or a bunch of books all over drawer or table tops).
My room is quite small so when I get careless it takes little time to fix itMy room is neat in general, but sometimes I can get careless and then it gets messy. But it doesn't take long for me to clean it up at least.