stinky

hello! so i am new here and this is my first post thread thingy, and i was wondering if someone could give me some advide on what to do with guinea pig smells. my guinea pigs live in my room, but they wont be able to for much longer if the smell continues like this. i really love having them...

As in depth as possible, what's the best way to bathe a skittish guinea pig? Malcolm's a boar and he hasn't had a bath since he's been staying with me (his previous owner did a bath once a month). He smells like poo and I wanna hold/cuddle him without having to pull my face away all the time...