WIPING MUD FROM A SHOE
SEIF 6 (Cont.)
The Bais Yosef says not only may one wipe mud from his foot, one may also wipe off his shoes. This is not comparable to scraping mud off one's shoes (using a knife), which because it might come to scraping something off the leather portion as well, be prohibited because it would be considered part of the Malacha of smoothing. However, just wiping one's shoes off will not result in scraping the leather, and is therefore permitted. Even if it does result in scraping some leather, it would not be a P'Sik Reisha. The proof is that Rava's Shamesh used to scrape Rava's shoe with a shard of pottery.
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