Set your compressor at 25 PSI. Or borrow a friend's small compressor.
Putting more than 75 PSI into your piping system isn't recommended. If you have to use high pressure, then be prepared to modulate the pressure by not having an air tight seal. I've used a clean shop rag wrapped around the compressor hose and the shower hose because it allows most of the air to escape through the fabric.
Take a clean paper towel and blow air from your compressor through it. Any oil spots? Then don't use it. There are simple DIY ways to remove most of the oil from compressed air though.
The ice maker? Nothing needs to be done to the solenoid that I know of. Other than removing the supply hose, letting gravity drain the solenoid. I'd just jumper 12V to it to turn it on and open it.
The supply side of the hose, I'd drape it over the edge and so when you blow air into the system, it gets blown dry too. Then reconnect it. Inside the freezer is where an ice maker lives so nothing needs to be done to that...though most people shut off the water, run a last tray or two of ice cubes, and then shut it off. Don't want thawed ice cubes in there all those months.
