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MB3 183b: Washing or Oiling Floors on Shabbos (337:3-4); Playing Instruments on Shabbos (338:1)
Washing or applying oil to a floor is prohibited on Shabbos. Washing down a counter on Shabbos. Blowing away dust or dirt is permissible. Placing a heavy item on the floor if it will smooth out the ground.
Playing an instrument or clapping to make music on Shabbos.