Looking for exterior/interior cleaning advice

[3Hummer]

what i do is i take it to a place to wash it, not just the one where you run your car through...they put it through the thing they have and then go over the whole car and clean anything that was missed... when i go offroading i just come back run it thorugh a BRUSHLESS ONE so it doesnt scratch when it rubs against the mud and what not, and that helps clean the under body....then i take it to the place where they wash it as well...i run it through the other first so it gets most off so they dont scratch it up...and every 3000 miles when i get an oil change they clean the engine compartment for me at HUMMER