Is Sea Foam Spray good for soaking cylinders? [SOLVED]

Thanks for the question! Yes, Sea Foam Spray through the spark plug hole works very well for soaking cylinders/rings. Here’s a quick overview on how to do it, as well as a detailed thread on our site with more questions and answers…

Remove the spark plugs and apply Sea Foam Spray into each cylinder cavity through the plug hole (about 3 seconds per cylinder). Let the engine sit and soak up to 3 days (if you have the time). Be sure to crank the engine once a day to loosen the rings. You can also add a little more Sea Foam Spray to each cylinder each day as it sits.

https://seafoamworks.com/questions-and-answers/the-best-way-to-soak-and-clean-piston-rings-in-your-engine-solved/#:~:text=How%20to%20do%20it%3A%20Remove,day%20to%20loosen%20the%20rings.