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.
If the sample button isn't showing up for you, try this direct link to Sampler.
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.