Years back, I managed one of the few shops in a 75mi radius that had an oil trap and a floor hoist. We had contacts at many local repair shops who would send them to us, so we did a lot of them -- uppers started at $25 + the cost of a hand wash, upper and lower $50 + the wash, bumper to bumper $75 + washing (dressing was always extra). We also were the only one who did undercoating -- which of course needed to be cleaned first. When I went out on my own, I would include it on a complete detail but never listed it as such, slowly it evolved to being a "by request," "up-sale," or "sweeten the deal" item -- similar to shampooing a trunk. Today, being fully mobile, I will explain to customers who request it, the implications of current EPA regulations (which allows them to make an educated decision on environmental issues). If they still want it done, I will take it to a facility that has a water/oil trap and charge accordingly -- exceptions are if it's in great shape were a light rinse and dress will not dirty up a new white driveway.
When I settle down with a shop, you can bet yer a** it will have an oil trap and a hoist!!