TCP is Trichlorophenylmethyliodosalicyl. It is a common strong antiseptic liquid safe to use on the skin. think Dettol liquid but a bit more powerful.
If you go into your local pharmacy they should have it on the shelves, it's not too expensive and you only need buy a small bottle as you just need a few dabs for the whole face each time.
It works by killing the yeast and bacteria on the first application and then all you have to do is dab a bit on if it comes back. After a while the bacteria stays away for longer periods, right now I only have to dab tcp on my face once every 2 weeks or so.