Cover the distributor with a plastic bag or some saran wrap. Keep out of the lectrical as best you can X2 on the simple green or if it is really oil some engine cleaner and a bruch. Leave the airbox closed up and you should be good. I normally do it with the engine running at temp any grease is soft and the simeple green and a brush is very effective.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184