Fourputt
Head Rules Official
I've rubbed my ball on the green to remove dirt since I didn't have a towel handy. I completely forgot about it, and when someone asked me if it was allowed, I immediately called the 2-stroke on myself.
While such an act isn't recommended, it also isn't a breach of Rule 16-1d unless it was done to test the green. You penalized yourself for no reason.
16-1d/5
Rubbing Ball on Putting Green for Cleaning Purposes
Q.May a player clean his ball by rubbing it on the putting green?
A.Yes, provided the act is not for the purpose of testing the surface of the putting green. It is recommended that a ball be cleaned in other ways to eliminate any question as to the player's intentions.
I'm still not positive if I actually broke this rule. I thought only the actual ground was ground. But in a tournament last summer my ball landed in a dried up water hazard so I hit it. I didn't ground my club but I did touch a cattail with it and that was called grounding because the cattail is growing in the ground.
Also not a penalty. Decision for Rule 13-4:
13-4/4
Touching Grass with Club During Practice Swing in Hazard
Q.A player takes a practice swing in a water hazard without grounding his club, but his club touches some long grass. Is there a penalty?
A.No - see Note to Rule 13-4. However, the player must ensure that his actions do not breach Rule 13-2 or constitute testing the condition of the hazard.
This is the note referred to above:
Note: At any time, including at address or in the backward movement for thestroke, the player may touch, with a club or otherwise, any obstruction, any construction declared by the Committee to be an integral part of the course or any grass, bush, tree or other growing thing.