Please be very very careful with these. I ruined several dress shirts with them, and was never able to get the stains out (even after following the "help line's" directions). I no longer use them, even though I've never had a problem with anything other than those shirts. Here's a summary of the problem---not my page---and it does seem to be limited to "work clothes" for some reason:
http://purexruinedmyshirts.com/