I've seen some 18 Gold players using 10.5 inch gloves. This can be accomplished by simply wiping dirt off using a dry sponge.
To be any good at almost any sport you'll want to "keep your eye on the ball". The Wiffle Ball Inc., PO Box 193, Shelton, CT 06484. https://www.storeboard.com/blogs/sports-and-fitness/get-the-competitive-edge-with-these-high-quality-baseball-gloves/5950623