The Nanoskin sponge would need easier to use than a clay bar? But is it or advertising hype?
http://www.amazon.com/Nanoskin-AS-019-AutoScrub-Grade-Sponge/dp/B00CUAWJ6G/ref=pd_sbs_263_1?ie=UTF8&refRID=0XD1V42V1BB252M45TC9&dpID=41D0X1tlLJL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_
How does one know when the clay bar is "used up" and one needs to replace the clay bar?
http://www.amazon.com/Nanoskin-AS-019-AutoScrub-Grade-Sponge/dp/B00CUAWJ6G/ref=pd_sbs_263_1?ie=UTF8&refRID=0XD1V42V1BB252M45TC9&dpID=41D0X1tlLJL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_
How does one know when the clay bar is "used up" and one needs to replace the clay bar?