Abstract: A knitted fabric cylinder is folded, rolled, reversed, and, preferably, sewn so as to contain two compartments, one of which is waterproof. It appears similar to, and functions as an ordinary knit putter cover, but can also be used to wash golf balls. The waterproof compartment is lined with a non-absorbent yarn, typically polyester, to facilitate the washing of golf balls. The other compartment is lined with an absorbent yarn, typically acrylic, and will stretch to conform the shape of an inserted putter head. A moisture barrier, preferably of molded synthetic rubber, backs the fabric of the waterproof washing compartment in order to securely retain detergent solution introduced into the washing compartment. A golf ball is inserted into the washing compartment and manually manipulated to wipe stains and debris from the surface of the ball. A putter head is received into a separate, knit fabric lined, putter compartment.