Essentially wipe clean would mean that you cleaned something in such a way that is now in a immaculate/spotless. There´s no way one can spot some dirt, speck of dust or something.
The expression suggests that one could find dirt, clutter, etc, (at least some, but sometimes plenty of it) previously.
brush/scrub/sweep/wash/wipe etc something clean.
As for "wipe" and "clean" I suggest you crawl into the websites Wordreference/Bab.la/The Free Dictionary.com etc, and you get good ideas and examples of the use of these words.