Whenever I grill meat it makes smoke which carries grease. I had a Flagstaff trailer that came with a wall mounted grill that I used for awhile. I did notice some buildup of grease on the awning. The bigger pain in the butt was the smoke from the fire would blow through the window or door and set off the smoke alarm in the galley. I ended up making an extension hose for the gas line so I could still use the trailer gas but move the grill to a table. Worked much better.
BTW, in my younger days I had a 59 Pan.
