Should be the job of ball boys to dry each ball as it is placed on it's station then hopefully most will be dry?I had a feeling it was banned, just got this info from Google ...
Yes, the English Football League (EFL) has banned the use of towels to dry the ball for throw-ins, but the Premier League has not. The EFL ban, which took effect for the 2023-24 season, was implemented to stop time-wasting and was accompanied by a new multi-ball system.
Premier League: The Premier League has not followed suit with a ban. While a Premier League player has recently been stopped from using a towel, this reflects recent enforcement of a grey area rather than a formal rule change.
Why the ban? The primary reason for the ban in the EFL is to prevent time-wasting by players who might otherwise take time to dry the ball.