And since the used solvent is easily recyclable, your costs are limited. If you've been using this set-up for years, you know what I'm talking about. So you can go now. The rest of you, look around your paint mixing area. Not only is that irresponsible, and an incredible waste of money, it's downright stupid.
Dirty guns mean down time, lack of pride in the department, and defects in the work.
Not only does it make good business sense to use an enclosed gun washer, but in many states and local jurisdictions the law requires it. Naturally, the body shops were targeted. You may be surprised to learn that you too are in a regulated area. And various state governments have enacted their own rules to regulate VOC emissions. Gun-washing practices were examined and the rate of emissions found to be worse than that for paint application.