I use
"Make-Up" brushes for the dash vents, window switches, console etc. They are soft and won't scratch plastic surfaces. Available at any drug store... cheap. This would primarily be for dry-dusting. For more stubborn stains down in the cracks, I use APC spray and
artist's paint brushes. (tape the metal ferrules so nothing gets scratched!)
For carpet, no extractor here... Old Skool at it's finest!

ancing Dot: First I vacuum, then spray liberally with
Woolite Heavy Traffic Carpet Foam (APC can be used if carpet foam is not available). Let soak for 5 minutes or so, then scrub with a stiff carpet brush. (Woolite HTCF also works great on fabric upholstery.:biggrin
I then rinse by flooding the carpet areas with water from a spray bottle and scrub with a "white" cotton towel until clean and damp. Repeat as many times as necessary until carpet is clean.
Then I dry with a Vornado Fan.
(I use a white towel because the dyes from a dark-colored towel
could potentially stain the carpet.)
The final step, when nearly dry is to brush with a stiff carpet brush to fluff the knap and give it that "freshly-steamed" look!:biggrin: