You know this free Persil ProClean laundry detergent sample is legit because the guy's wearing a bow tie. Glad to see I'm not the only person who does my laundry in formal wear.
Look for the red button that says “Claim 1 FREE Persil OXI Disc Sample” throughout the page. It will then load a Sampler.io page that will ask for 3 or 4 demographic questions, then let you know if you qualify. It seems most people are getting the freebie, even myself! After you're selected, the free detergent should arrive in four weeks.