Clean dirty pistons while still in engine?

Marcohotrod said
if it was running lean as someone thought,there would not be much carbon . I do not think it was lean. I would not go crazy cleaning, it is not a big deal. use wd40 or whatever, let it dry well then use a vacuum cleaner

I sprayed a lot of WD-40 in my cylinders just to keep out moisture. ....a week later a rag removed most all my carbon...I was surprised!

Jeff