How do you clean your LO ear? My LO is 7months and I have not really clean it only use a water cloth to wipe it.. Is it clean?

There's actually no need to clean ears - they are self-cleaning and the wax is there to help protect the ears! They usually just get out on their own, so there's hardly any issues with it - but a small group of people may have excessive earwax issues. If you want to clean, a damp cloth (not wet/dripping) is sufficient - don't go into the ear or try to dig it with anything - especially when they're young because they might fidget and cause trouble!