Training The Staff - Brushing

We all love to be brushed, at least most of us, and we all face the same communications issue with getting overzealous brushers to understand when to stop. I have found a three step approach to work quite well.
1. Do the standard thing of raising your head and perking your ears.
If this works consider yourself blessed with perceptive staff, otherwise try
2. Gently repulse the wrist of the brushing hand with one paw. Do not use any claw action with this. 90% of the time this will work. Give it a few seconds, but if your staff is especially dim escalate to
3. Clench brushing arm with both paws and deliver a delicate but firm nip to the brushing hand. The soft flesh at the base of the thumb is an effective target for immediate reaction