Anything that you drive in and out of, where a machine does the work. machines leak hydraulic fluid and drip contaminants. Touchless isn't really all that bad, but as we all know, all dirt does not just rinse off. In your situation, it is understandable that you take your Edge to get it cleaned and at least you are keeping it clean. However, nothing beats a good 'ole hand wash and spot-free rinse...use a blower if necessary, but never hand dry.