Looks like you can only get it in a spray now http://cgi.ebay.co.uk/Duramitex-Plus-200ml_W0QQitemZ260425612854QQcmdZViewItemQQptZUK_Pet_Supplies_Birds?hash=item3ca2937e36&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A6%7C72%3A1686%7C293%3A1%7C294%3A24
If they have lice and you want to get rid of them on the hurry-up use the powder then after put vinegar in their bath once a week to keep them free of them.
Used Duramitex as a dip years ago but at half strength, yes it cleaned them of lice. Added the rest of the bottle after dipping to spray lofts out against red mite.
A good race can be had sending w/hood cocks driving. This time of year most w/hood teams have been flown on that system for around 12-14 weeks and have gone stale. Something to be used on their last race if only spending one night in the basket.