Nice order of operations, I wish we all had time to give a customer back their vehicle with most of the oil cleaned away but most of us are very busy in our daily repairs, cheers. For those of us who give some added time, go ahead and try the bathroom spray cleaner, SCRUBBING BUBBLES, see how much you need for a certain size job, wash it off, redo if needed and charge for your misc expenses. Compare this to Engine GUNK and see which you like better? Effectiveness vs cost vs cleaning effort vs environment.