The last player I can think of really used the windshield wiper technique on his forehand was Thomas Muster. However, with Federer's great shot variety, I'm sure he can hit that way if he wants.
Federer and Nadal use a version of the windshield wiper forehand, also known as a kick forehand. Your pre-shot preparation is just slightly farther more away from your body and swing through the ball normal and finish above your shoulder, the key is you have to take the ball high so the net does not come into play, this is an offensive shot and must be played inside the court, high to high.