Can anyone advise me about the actual spng product? I went to their website (<a href="http://www.spongetechs.com/3-Pack-Car-Kit-Loose-p/504226.htm)" rel="nofollow" target="_blank">http://www.spongetechs.com/3-Pack-Car-Kit-Loose-p/504226.htm)</a> and it said that a car sponge was good for 8 washes. What happens after the 8th wash? Is the sponge useless afterwards?