I am a fan of compressed air too, you can use WD40 but you will have to clean all that off before re-installing.
When you are putting the grips back on clean the bar and inside of the grip with rubbing alcohol and once that dries spray the inside of the grip with hair spray. This will help the clean grip slide onto the bar and kinda stick it to the bar. I have does this for decades on dirt bikes and mountain bikes and my grips always stay put when my buds would come loose on nasty rainy rides so I swear by it.
Boil water, then place end of handlebar w/ grip in the hot water for about 30 seconds. the grip will soften and will push right off. will not damage or distort the grip. i've done it many times with my thruxton grips and my gf's bonnie grips.
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