No. You should avoid it as much as possible. It’s illegal to pour hazardous chemicals into any part of your community’s water system. If you’re on a septic tank, it could kill the bacteria that make it work. Even if the product itself is marked as environmentally friendly or biodegradable, by the time it has gathered all the dirt and oil off your engine the resulting mixture will be unpleasant and possibly dangerous. The ideal solution is to use tough, absorbent matting like the one we recommend above, which can be reused and eventually disposed of at a hazardous waste collection center.