Didymo advice updated February 11th, 2020 2007-04-22T11:41:41+12:00 The NZRCA’s revised didymo advice puts particular emphasis on using household disinfectant containing the active ingredient benzalkonium chloride as the most suitable agent for cleaning kayaking clothing and equipment. A summary of the Check, Clean, Dry protocol is available in the NZRCA Didymo flyer (PDF, 220k); print it out and take it with you on trips. Access, Conservation