At one point yesterday, Tiger bent over and blew on his golf ball, presumably to remove a bug. I often see players waving or blowing at a marked ball on the putting green, but have never before seen a professional take this risk of potentially moving a ball in play. I did not think it was illegal, but my brother asked why that would not be considered cleaning the ball as grass, sand etc. could be displaced along with the bug. Is this addresses specifically in the Rules?
Edit - knew i should have looked harder before asking.
Rule 23-1/5 Removal of Insect on Ball
Q. A live insect is stationary or crawling on a player's ball which is lying through the green. May the player remove the insect with his fingers or blow the insect off the ball?
A. Yes, in both cases, under Rule 23-1. A live insect is not considered to be adhering to the ball and therefore is a loose impediment — see Definition of "Loose Impediments."