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I've used about 10L of BH Auto-foam over the years and recently switched to Touch-less. Auto-foam might be a little better at cleaning but Touch-Less is noticeably easier to rinse off. It's definitely a prewash and does better than just a pressure washer at removing that initial contamination.
As only a touchless wash it does okay, especially on a maintained/coated car that isn't too dirty. I'll sometimes use it in such a manner when I don't have time to wash midweek but say it rained and a bunch of road contamination got on the car. A more frequent use for me has been for a quick wash on the wife's car, which I contact wash monthly but do a touchless foam/rinse in-between washes. Keep in mind I follow all this up with a deionized water rinse and a quick pass with the leaf blower.
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