My 4 year old roper washer leaves grease on clothes. On spin cycle the machine makes a screaching noise, and the clothes don't spin dry.

Possible that the belt is slipping and also there is some issue with the agitator as the gaps within seems to bring up the dirt or grease mix to the clothes.
So it is important to remove the panel and check the play on the belt, replace if the play is high and check if the agitator bearings are worn out. If so the agitator assembly must be taken out and checked.