Just washed it all out again, dried it with a cotton bud thing and a hair dryer, looked at some vaping forum that said to basically do what I did plus a few other things like hold it upside down and fire it. Screwed the thing on as hard as I possible could this time and it's still doing it.
I'm close to losing my temper with it if I'm honest. You buy a packet of fags and you can be halfway down one by the time the change is in your pocket, you don't have to assemble half a jet engine to do it.
It's not complicated. What juice are you using? Crap stuff tastes crap and personally I cant stomach coffee or tobacco flavours.