I hit door jams with first an Alkaline based acid, then pressure wash then hit it again with a Hydrochloric based acid. I've done countless cars with this technique and never had a problem, I've also never seen door jams so clean afterword.
Oh yes an example of these products on AG are Meg's Green APC, and then Wheel Brightener, although it's not technically a Hydrochloric it does the same job, but a Hydrochloric will do it better.
Oh yes an example of these products on AG are Meg's Green APC, and then Wheel Brightener, although it's not technically a Hydrochloric it does the same job, but a Hydrochloric will do it better.