It's never a good idea, to let your friend move into your spare room

Hi Mark
I've let my friend move into my spare room for the last two months, as he had nowhere to go and I felt sorry for him. We have been friends since we were in school and we've always got on well. The problem I'm having is he doesn't clean up after himself, and my place is becoming a dumping ground for his stuff.
I'm always picking up after him, and I feel like this is becoming more his place than mine. I don't want to fall out with him about this, but I'm fed up with feeling like his mother. How do you think I should go about talking to him?
'Marks response'
If you really want to get to know somebody, move in with them! This is a big test when it comes to seeing if your friendship is as good as you think it is. Many people, including myself, have lost a few good friends over this matter, and to be honest, it's not worth it.
In any situation, be it moving in with a friend or a partner, you're going to find it hard first to adapt. It's especially harder when it comes to them moving into your property and how you like to have everything in its place. You know: leaving the toilet seat down, when they leave it up or having to put away something they've used, as they can't be bothered to.
I've personally gone as far as leaving one Knife, one fork, one plate out, Ext. Because my friend would always leave his dirty plates in the sink for me or the fairies to clean up. As I've always said, you need to address these things as quickly as possible. The longer you leave something you're not happy with, the more it'll become an issue, and also, the person you have an issue with might not even realise. Rember silence is approval.