OK here it is...I got to talking with the Supermarket Manager in town and casually asked him when he was going to let me get rid of all the chewing gum from the sidewalk....he says to me " I wont pay for it again, there was acompany that came out with a huge machine with hot water and spent ALL NIGHT, the gum was gone but there was still spots". So this obviously was the infamous ghost left behing. Apparently...and I love this type of cempetition.. Company X did everything with a wand and no surface cleaner, so I know I can do the whole job quicker with my Surface cleaner but my ultimate question is...how can i do a sure fire demo that removes the gum ghost so i can get this contract? There has to be something out there..I searched and pulled up ZEP oven brite...is this the only chem that works?? I want to prove this manager wrong even if as a marketing gig I give the job away!!!