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Movable obstruction such as a bag or towel - Removing a movable obstruction
You may remove a movable obstruction without penalty anywhere on or off the course and may do so in any way.
If your ball moves while you are removing a movable obstruction, there is no penalty and your ball must be replaced on its original spot (which if not known must be estimated).
But there are two exceptions when movable obstructions cannot be removed:
Exception 1 – Tee Markers Must Not be Moved When Ball Will Be Played from Teeing Area.
Exception 2 – Restrictions on Deliberately Removing Movable Obstruction to Affect a Ball in Motion.
DIAGRAM #1 15.2a: BALL MOVES WHEN MOVABLE OBSTRUCTION REMOVED (EXCEPT WHEN BALL IN OR ON OBSTRUCTION)