Does anyone know if the use status on Clean N Dull has changed? I practiced next to someone that was using clean and dull and he asked if I had ever used it.  I told him that it was good stuff, but I was looking for something I could use while bowling.  He said it could be used and showed me the bottle and it said for anytime use.  I have a bottle and it says only for before and after.  His bottle was a lot newer than mine as well. His was a cylindrical clear bottle with a squeeze flip top. 

His looked like the one on this site

http://www.ilmbowlingsupply.com/product/ebonite-powerhouse-5-oz-clean-n-dull-bowling-ball-cleaner-usbc-approved

Mine looks like the one on buddies site.  Buddies site also says for use during competition.  Many sites that are selling it say that it is approved during competition. I know clean n dull was approved a while back and then taken off, so perhaps all of this is just old info.

http://www.buddiesproshop.com/p-1031-powerhouse-clean-n-dull-5-oz.aspx

I don't think it's an oversight. The status of Clean & Dull, as to whether it can be used During bowling or only Before or After, has changed several times over the years. I'm sure whoever marketed it at the time of its bottling abided by the USBC/ABC rules. Right now, it is approved for use ONLY BEFORE OR AFTER bowling, not DURING bowling. So it doesn't make any difference what the bottle says, he can't use it during bowling.

See the current USBC listing:
http://usbcongress.http.internapcdn.net/usbcongress/bowl/equipandspecs/pdfs/Approved_cleaner_polish.pdf