Update 9/17 - Looks like they are now requiring a Costco member ID in order to get this free sample.
There's a new offer for a free sample of Wisk laundry detergent and this time it's from Costco.
To get your free sample of Wisk laundry detergent, click on Get a Sample and then fill out your information. They ask for your Costco member ID but this is not required. You'll receive your 1.56 fl. oz. sample in 4-6 weeks.
This freebie is available while supplies last to those 18 or older in the U.S. It's a limit of one per household.