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It's not permanent. If you wanna remove the grips later on, use a thin screwdriver or allen key or even a kebab skewer (anything really that can get between the grips and your bars without doing any damage) and insert the nozzle from your WD40, spray away and start rotating the grips (after removing the screwdriver and nozzle). The further in you get and spray the easier it'll be to get the grips off. Whole process takes less than 10 seconds. Super easy.
Hairspray if you never want to take your grips off ever again..