Bad Turbo Puting oil in the airtanks.

I thought the truck i was working on had a bad compresser. Last fall i replaced the dash valves and saw it had oil in it. It is a farm truck so it was parked after that. I started working on it friday and to day i pulled the compresser intake tube off that supplys air from the engines head to the compresser. It had some oil in it so i pulled the hose that runs from the outlet side of the turbo to the cooler if front of the rad. It was coated with black sticky oil. It is a M11. Is there any way to clean the air brake system out? I have been told that the oil will eat up the rubber parts.