I wanted to pull the head and check the valves. I also wanted to de-carbonize the head and top of the engine. After pulling the head, I poured some Sea-Foam over the carbon area and let it soak. I scraped it with a plastic scraper and then more Sea-Foam soaking. I repeated the process 3 times, each time letting it soak about 15-20 minutes. I then ended with a gentle wipe with a ScotchBrite pad with carb cleaner. I got most of the carbon off of the head and some off of the piston. The piston is setting at TDC and soaking with Sea-Foam also.
I think I need to pull the valves out too and let them soak. Any special tools needed for that before I pop that cover off? How hard is it getting the retaining clips off or getting off whatever is holding the valves in place?