Never use scotch-brite to clean a engine
you will get little particles all through the engine that you can't even see it can get in the bearings and in the oil pump and really screw a engine up. I know people do it all the time and i have done it in the past but no more for me anyway. I had a friend do it and i told him not to and it wasen't long till he had to tear his engine back down and found particles in the oil-pump and through out the engine. JMO
You do it if you want to or feel comfortable doing it , Never know you might get lucky
But if your not then remember you were told. JMO
but the thing is you are talking about doing the cylinders with it. I just don't see how you can get it all out. IMHO Some people might say different but i am just stating what can happen that's all.