[Jeph]

The driver side vent is the one you really have to be careful about spraying. I doubt you did anything to harm it (it does have a drain in there), but avoid direct spraying in that area -especially with a high pressure sprayer.

If your bumper cover is original, it's made of plastic (and if it's not, it could be fiberglass -either way, it's not metal). I would think you'd cover a scratch with some touch-up paint. It's my "crud" of choice.