I removed both rocker panels on my recently acquired '74 2.0 914 today. The passenger side longitudinal was as clean as a whistle, and that panel had evidently been off in the recent past. The driver's side panel was a bit harder to get off, but with the help of some judiciously applied PBBlaster, eventually yielded.
This is what the area around the jacking point looked like:
That's about 2lbs of dry and crumbly dirt. It doesn't appear to have had any detrimental effect, as there is no evidence of any rust after clearing it away.
I can't decide if the dirt got in from around the jacking hole, or if it entered via the rear wheel well. The jack holes have the plugs in them, which seem to seal around the hole edge quite well.
In any case, is there an advised method for preventing stuff lodging behind these panels?
Thanks!