The Project Farm guy tested Seafoam and it worked for him. He makes videos testing all kinds of garage stuff, and his tests are at least as interesting as the results.

https://www.youtube.com/watch?v=agAWXnT4-EQ

I'm a believer in Seafoam and use it in all my small engines. For me it shines in stuff that has been sitting for a while.

I use it as a fuel stabilizer and preventative measure but after trying it numerous times I've never found it to be a substitute for pulling the carb and cleaning it properly.

I've started using it in small, carbureted engines with ethanol gas. Makes a difference. Runs smoother, more power. And I'm not a snake oil guy.

Going to try it in my beater. Has some drivability concerns.