1 - 1 Litre plastic pouring jug - $2.00 at Dollar Store
4 - 2" Scrub brushes - $2.00 at Dollar Store
1 - 6" Plastic cutting board - $4.00 at Zellers, Walmart, Target, etc
8 - Small wood screws
Power drill, drill bit, screw driver, 1-3/4" hole saw, jig saw
The scrub brushes I bought are 2" and had handles, they were 2 for a dollar. I cut the handles off of the brushes. I then mounted the 4 brushes inside the plastic pouring jug by drilling two holes per brush and then screwed the brushes to the sides of the jug. They are mounted across from each other. The handle on the jug is perfect for holding the jug while cleaning the balls.
I then took the cutting board and used the hole saw to drill out a 1-3/4" hole at the bottom of the board. I then cut the sides off of the cutting board to fit inside the jug. See the photos. You are now finished, simply fill the jug with a little hot water and soap, slip a ball into the hole of the cutting board, put the ball between the brushed and clean away. Hope this works for you. Any questions, please don't hesitate to email me. Thanks for looking.