My car sat forever, and all I did is just pop off the drain plug and just let it sit for a while. Even though it is not warm, all of the oil is in the pan, so it will come out...ya just can't be in a hurry. I also took the lower pan off...not for reason of draining oil, but I'm sure it helped a little. Then throw some new oil in there and disconnect the ignition and let it crank a little bit to get oil up in the motor before actually starting it.
What kind of cleaner are you going to use?
'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.
"A Mercedes-Benz is like a fine wine, it only gets better with age."