DIY way to wash sand/clay out of driveway gravel?
The clay/sand/finds help bind the gravel and create a macadamized and tough surface.  Removing the fines will loosen the gravel, and unless you have  a vibrating tamper/grader, your road will be in far worse condition when you are done.

Traditionally, people simply watered the roads to keep the dust down, but you can also put some lime on it.