I needed to remove a door the other day and was disappointed to find that the pozidrive screws holding the hinges in had all been painted over with about three coats of gloss paint.
In the past I've used a Stanley knife to clean out the paint from old fashioned slot headed screws but I thought Pozidrive screws full of paint would be a nightmare.
I then had the idea of using my recently purchased impact driver and it was a revelation! The screws came out really easily with no preparation - and then went back in again!