I don't think I've ever washed mine.....ever. I did degrease it once though....it was pretty bad. I'm not that concerned about it. It's just a truck, not a show piece. Makes me money either way.
The 379 I’ve been driving gets a wash every other time or so that the cattle pot does. But as a company driver I’m not paid if the wheels aren’t turning so I have never polished it.
If you ever need it to rain, skip the rain dance and just let me get my truck washed. Once it's all clean and looking sharp, it's guaranteed to rain.