How to keep my home CLEAN?!?!

I can clean my place from top to bottom and the next day its messy again. Now a few people I love dearly have a key to my place and I'd hate to have them enter my home (if need be) and see it filthy. How do I manage to keep it clean while raising a kid and working as a single mom? Im not afraid to admit I could use some tips on keeping my home orderly. I WELCOME any advice so I dont get caught slipping LOL.