You have drain valves on the air tanks. The primary thing you will get is moisture. Unfortunately, if it stays there too long, you will also get rust. What are you experiencing?
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Michael and Georgia Day
1992 Newell 43.5' #281
8V92 DDEC-2, HT740
PT Cruiser GT with Remco Transmission Pump https://newellowner.com/newell-photos/
There is whats called air brake antifreeze for flushing your air system. After flushing, blow out all lines to remove crud, blow out new hoses before installation, and be diligent about draining air tanks.
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"I dare you to say that to my face!" - David