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Optical micrographs of live gecko toe pads adhering to a glass surface when (a) it is clean (never dirtied), (b) right after dirtied, (c) self-cleaned by eight steps of free walking with digital hyperextension on clean glass substrate, and (d) the footprint after one step. Arrows in (c) point to some of the remaining dirt particles that can be easily identified after eight steps of self-cleaning.
