Since i purhased my 92 a couple years ago ive been flushing out the inner and outer frame and been appling rust check(oil guard type of substance).I fabbed up a spray type contraption by clamping a length of copper tubing to a brass hose fitting that fits my garden hose.By crimping the end of the copper tube a bit i can get a not bad spray pattern with some sort of adequate pressure.The copper is flexable so you can manouver it up ,down,arond the inside of the rail.The first time i did it the amount of crap that came out was unreal.Going to do this yearly and hope it helps.