I didn't bother cleaning the tyres or wheels before gluing, so it's not critical. Just take the time to make sure there is glue under the bead all the way round while being held by rubber bands, then run a ring round the outside for good measure. Give them a little while to set properly, don't start gluing a set up 5 minutes before you're due on!
At the oOple race M3's all round on 4wd, and M4 rears with B4 kit M3 front ribs were the ticket
I also used JConcepts moulded inserts which I felt made the tyres more consistent, though the standard foams work too if you cut them correctly.