Would you use the vinyl prep or the Plastic and leather prep on the armrest part of the door panel?
I've got a can of each but they're both maybe 15 years old. The shelf life for the spray cans is 3 years under ideal conditions, but the shelf life for the brush on stuff is indefinite. I've tested my cans and they still spray good. I wonder if the product has really gone bad? I've also got the soap (new), and I'm wondering if it is even necessary to use the preps with the soap.