Depending on how old they are, use an old pot scrubber and a mild detergent and scrub them clean, then dry with a towel.
If buying new grips is not in the budget, go to a sporting goods store and buy Tennis Racket Tape and apply it to your old grips after cleaning them.
But, You can buy new grips for around 2 bucks a piece and put them on yourself. Buying all 14 at the same time is cheaper than buying them individually.
Depending on how old they are, use an old pot scrubber and a mild detergent and scrub them clean, then dry with a towel.
If buying new grips is not in the budget, go to a sporting goods store and buy Tennis Racket Tape and apply it to your old grips after cleaning them.
But, You can buy new grips for around 2 bucks a piece and put them on yourself. Buying all 14 at the same time is cheaper than buying them individually.
You could put pine tar or another "baseball bat" product on them.
You also could buy a new grip for about $15 and replace the old smooth grip.
you could try playing on days where the humidity is high
sand paper them