[header] How to find new uses for old tennis balls [title] Inspect the old tennis balls. [step] If they're dirty, give them a quick wash. A simple soap and water solution rubbed over the dirty parts will probably suffice, or tennis balls can be placed in the washing machine inside a. 
If they're split, they may still have some uses, so don't throw them out just yet. [title] Put old tennis balls to good use around the house.