Take the grips all the way off. Spray the inside with hair spray, Re-install the grips while the spray is still wet. Wipe off the excess than let them sit for a few hours. If you have problems getting the grips all the way off, use a small screw driver to pry the grip away from the bar and spray a little window cleaner in the gap. Do this all the way around. Make sure you have cleaned up the windex before you do the hair spray. If you have to buy hair spray for this get the cheapest extra holding power stuff you can find. If not, whatever you have around the house is fine.
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Pete
Infinity LWB (Godiva)
TerraTrike Zoomer (Yellow Peril)
Sun EZ-Rider (Wife's bike)
"Blind respect for authority is the greatest enemy of truth."
A. Einstein