As for Mileage I would use Mile IQ on the phone. It allows you to log Milage on you Vehicle via GPS. Swipe left for bussiness and Swipe right for personal. All mileage is logged.
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I would try Rapid Remover. It's a spray designed to remove vehicle wrap adhesive. Spray on leave on for 1min wipe off. It's worked well for me with old dried on adhesive.
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Either one will work. Rapid remover and Tar X are both great products. I use rapid remover all the time. Spray wait 60 sec then wipe.
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If you use a heat gun or steamer to remove it is would purchase some Rapid Remover. It's for removing glues or any tacky substance. I also believe it was created for the vehicle rap industry but don't quote me on that. It is pricy so make sure you charge appropriately.
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The brown spot may be a rust spot the can occur when there is a tiny pinhole on you paint that goes to the metal. A quick spritz of Iron X will fix that easily if that is what it is.
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