Q. I heard that there an inyan in taking a shower on Motzei Shabbes, could that be true?
A. Although it is not a common tradition at all, Piskei Teshuvos (300: 2 n. 32) does mention that some Rebes would follow this minhag. It is based on Rashi (Shabbos 119b) on the saying “Chamin beMotzei Shabbos, melugma). Rashi explains that chamin means both for drinking and washing. Melugma is a refuah.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a