Juan and Oilfield-
I use car wash every time I wash my S-10. I keep my S-10 fairly clean also. Regular car wash does not contain any abrasives, some of them do have a small amount of wax added to the formula but that isn't going to hurt anything. I have used several types of car wash all over the bike and the matte paint still looks good.
I have been using a pressure washer on my cars and motorcycles for years with no issues. The trick is to not use a powerful, commercial grade pressure washer and do not use a narrow stream nozzle. I use a 40 degree fan nozzle that is specially designed for washing vehicles. It is not concentrated enough to push water into places it isn't supposed to be. Even with that, do not hold the nozzle too close to the surface you are washing, 2-5 feet away works great and you wont have any problems.
For drying, I use a cotton towel or microfiber to wipe down all of the flat surfaces and then I use a leaf blower to blow the water out of all the crevasses and tight spots. Again, I have been using this method for years and no problems. Wax as you dry type products work great also if you want a little extra shine on glossy surfaces.