sorry to beat a dead horse.....I know there are a million ways to remove rust on here and I have read a ton already but I cant seem to find what i think im needing. I am looking for something I can pour or spray in the hard to reach areas of a car body, such as inside the doors and window areas, im needing something somewhat safe that wont eat the bit of metal i have left on the car. something that can soak and rinse the rust away???? Evapo rust??? Phosphoric prep,??? thanks!!