Excel 2007 : Custom number format in chart

[Nitesnow]

I was wondering if anyone knew how to delete custom formatting from the excel charts. I was experimenting and added some values but I cant seem to find a way to delete them. I searched the web as well as this forum (perhaps the keywords I was using wasn't helpful) but couldn't figure out how to do it.

The closest I came to finding an answer was this link: http://www.excelbanter.com/showthread.php?t=218679

But they seem to be talking about editing excel workbook as such.. and compiling it.. I'm not sure how thats done either.

Any help would be appreciated.