Kent Fletcher wrote:
Many of the rafting supply stores sell a product call Knockout that is
made for this purpose. It is a liquid and you put in a very small
amount. It is a concentrated deodorant, and has worked pretty well on
our week long trips. It is fairly expensive, but lasts a long time
since you only use a little splash at a time.

Found it, thanks. NRS used to sell it but apparently gave up doing so.
http://www.greatoutdoors.com/nrs/sho...treatment.html

The Odorlos is less expensive, and a dry powder (liquids are difficult
to carry on kayak trips) so I'm going to try it out on our next trip.