I own a GMC 2500 also. Its spring cleaning took about the same amount of time. Got rid of swirls and winter crud. The effort was worth it .
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I have a black GMC 2500 Sierra and bought the Wolfgang Ultimate shine kit. Pricey but haven't regretted it .
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I have a vent free gas heater that mounts to the wall. You can get blower fans for them to help move the heat around. They are safe to use in enclosed areas and you can get one to run off propane or natural gas.
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I bought the Wolfgang- Pinnacle kit to use on our dark colored vehicles. Like it real well on the black GMC Sierra 2500. I'll try to add pic.
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Used the Pinnacle - Wolfgang kit on my black GMC Sierra 2500 and my wife's midnight blue Buick Enclave and was pleased with the results on both.
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