Whirlpool Microwave excessive grease build up

Question

When I first got my microwave oven the steam build up was go great that the turntable broke. I replaced that, but still have excessive steam build up. Also there seems to be an excess of grease in the top of the oven. Is there a way to clean this? I cook bacon quite a bit. I have noticed at times that there are drops of water on the ceiling of the microwave.