This notion that beards are unclean is a generalisation, and in most cases just not true - the majority of men with one wash their faces at least once each day, which is probably more frequent than a lot of people wash the hair on their head.
I think a neatly trimmed beard looks nice, and actually suits some men really well, better than when they shave it off.
I’m not a fan of big, bushy beards - to me they look rather ridiculous, but, hey, each to their own. It’s a good thing that we don’t all like exactly the same things.