One of my rebeeim Harav Refael Green A”H said that the Gra did go to the Mikva on Shabbos. The Stypler Gaon ZL stood in front of a fan on Shabbos after the Mikve to dry himself. Hagan HaRav Moshe Feinstein ZL held ( in egros moshe) that drying ones head lightly with a towel is mutar.
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