btw, those water spots that you could not remove in the engine bay are something that those of us who detail their engine bays have always had to deal with. they are really evident the first time that you attempt to clean up your engine bay, and the majority are the result of water from puddles being baked on by engine heat. as such, they are tough to remove, as you discovered the hard way. now, i for one would have never used the product that you used to try and remove them, as it's far too abrasive. a better method, and one that has always worked for me, is to first try a regular non-cleaner type wax on them, and if that doesn't work, then try a cleaner type wax. the good news is that once you remove them, and if you continue to wash and wax the engine bay, you will notice that they don't form nearly as often, and are much easier to remove when they do. enjoy.