Give her hell with a pressure washer. Try not to get too much water in the alternator and don't spray into the intake. That's about it. I hear biodiesel is the best cleaner but I usually just use water
You can't go to the drive thru car washes, go to the DIY ones, much more fun.It'll cut through that stuff no problem. Varsol is just more money that you don't need to spend. Try just the pressure washer and if you feel varsol is needed have at it. I'm not sure but I think it may dry out seals.