sand paper it (course type) and clean using water n dish cleaning liquid. if it still doesnt work, then it's time to change grips. :)
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You firstly need to remove the old grips by cutting off with a Stanley knife and scraping off the old grip tape. You will need to secure the club in a rubber vice clamp. You then get put a piece of grip tape on the end of the shaft with about half an inch overlap, which you then fold together and tuck into the butt end of the shaft, you then spray or pour grip solvent, petrol or white spirit on to the grip and then put plenty in the actual grip (whilst plugging the bottom of the grip with your thumb) shake well then pour the liquid over the grip tape. You line the grip up, and squeeze the end to get it started, then use your thumbs to apply pressure to the grip as you slide it up the shaft without stopping. You then take it out of the vice and stand at address to check the grip is alligned perfectly.
If they are loose you will most likely have to take them off. It will twist during your swing and open/close the clubface resulting in a poor shot. If they are newly done and your local pro did them take them back. If you did them, ask him to try and take them off and then regrip them.