I believe that white vinegar can help remove the salt stains.
For the door jambs. I would dilute OPC to 10:1 and spray on the jambs. Let it soak for bit. Then fill a bucket with clean water and get a MF towel in there and ring it out some. Proceed to wipe the jambs clean. After this I would follow up with a quick detailer or ONR diluted because the OPC may leave streaking.