You spend a lot of time in your truck. Ideally, you want to keep it clean both inside and out.
Do you have a calendar? Chances are you do, and on that calendar you should plan to get your truck’s exterior washed regularly. Pick a certain date and time every couple weeks and stick to it. For instance, every two weeks on a Friday at Noon you’ll commit to getting the truck’s exterior washed. By putting this task on your calendar, you’re more apt to stick to it than if you don’t.
Since you need to see clearly out of your windows at all times, pay special attention to cleaning the windows regularly, too. Window cleaner and a damp cloth or newspaper do the trick.
As for the interior of the cab, garbage tends to accumulate over time. Therefore, designate a waste bag in a certain spot so instead of throwing wrappers on the floor, they all end up in your particular waste bag which can then be thrown out at the next truck stop.
Some truckers opt to only eat and drink at rest stops ensuring that they don’t spill anything in their cab.
Vacuuming the floor and in between the seats is a good idea once a month. You can spread some baking soda on the carpet before vacuuming if you’d like. Floor mats can be sprayed with a hose outside of the truck, allowed to dry, and then put back in.
An air compressor can be used to get dust and dirt out of your truck’s vents.
Disinfectant wipes work well to clean up dirt in the cab.
If the interior smells funky there’s always Febreze: http://febreze.com/en-us You can pick up a bottle at most Wal-Marts.
If you don’t want to clean the interior, there’s always the option of paying someone/a service to do so.