I wouldn't bother with spraying anything in the cylinders. But I'd pull the shutdown solenoid wire and crank the engine a few revolutions. Then reconnect the wire and start it up. In the shop where I worked we'd rebuild various diesel engines and they might sit in storage for 2+ years. Only thing we ever did was install them, check the oil and start them up. The only problem with stale fuel is if it's got algae in it. Depends on your climate, etc. Once you get it running you can add an algaecide to the fuel tank to be on the safe side. I'd definitely change differential fluid---everyone neglects that. It's supposed to be changed every 60-80 thousand miles.
Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.