These guys will hate me for saying this, but OVEN CLEANER will soften that stuff up BUT...... ya really have to watch how long you put it on there and use small amounts, and IMMEDIATELY have water ready the minute you get off what it is your after, then wash it all of right away. If your worried about clearcoat and all that and its a good truck, mmm think this over real good. The usual overn cleaners today have to sit a long long time before they will even work and even then they only work for a minute or so before they loose effectiveness once they intereact with the paint. If you have a couple good coats under all that, clear coat etc, or can just put this stuff (say with a cuetip or something) on what it is you want to soften up, then you'll be alright. I absolutely must say use this as a last resort. I have done it on my FORD, my BMW, Chevy and Jag too, after the local vandals spray painted our cars and I did ok, but thats me. It was a long slow process. USE YOUR OWN DISCRETION ON THIS TECHNIQUE. Only do this if you know what your doing, AND if you know what your doing, you won't do this anyway. :)