There are many brands of drain opener out there, but Drano and Liquid Plumr are by far the two most popular. A video on those two brands and their backgrounds would be interesting, especially since Drano has changed ownership over time (from Drackett to SC Johnson) and Liquid Plumr is owned by Clorox. Most people probably don’t know that, and also both brands have gone after the other in their advertising over the years.