I worked at a company called Geo Strip. We used baking soda as a blast media. Very dusty so we used water to keep the dust down. But then the water made the bakeing soda stick to you turned my hair from dark brown do dirty blond. Then I ran a lapper at Ford Motor Company. A lapper is a maching that merrys gears. They use a clay for the lapping coumpound it is gray and had oil in it. The first week there I threw away every piece of clothing that I wore to work.