67 camaro rs vert frame off question

[radtexas]

New to this forum and enjoying the reading. Also I am new to this level of car work so will be visiting often. Car has been in storage awaiting restoration since 81 when previous owner bought it. He never got started and car steel is not in bad shape but interior and top are pretty shot and no motor or tranny. I took the subframe off this past weekend. I plan to clean up and Por 15 all under side and frame. Maybe silly question but is there anything I can do to preserve the inside of the frame? Other than hose out all the dirt diver nest? Just want to preserve if there is a simple way.

[gtotto]

I used an undercoating attachment (long plastic hose with multidirectional nozzle ) connected to a small spray gun. I sprayed the POR 15 in every accessible frame hole using an in and out motion . Worked very well on a Jeep frame and an A body full frame.