There are a few potential consequences: Residue Buildup: Over time, the polishing compound, waxes, or other chemicals you're using can build up on the foam. This accumulated residue can make the PowerBall less effective and might also cause uneven polishing or streaking in the future. Contamination: Any dirt, debris, or contaminants that get caught in the PowerBall during use can become embedded in the foam. If not cleaned out, these contaminants can scratch or damage surfaces the next time you use the PowerBall. Reduced Lifespan: The buildup of compounds and contaminants can cause the foam to break down faster, reducing the overall lifespan of the PowerBall. Regular cleaning can help keep the foam in good condition for longer. Hardening: Some compounds or waxes can harden over time. If left on the PowerBall, they can solidify, making the foam less flexible and potentially leading to uneven application the next time you use it.