I've got a block that has had the head off for a bit now. The walls of the cyl look fine, but I'd just like to clean up the very top of the bore where the rings don't reach. There is the common carbon build up on top, and the pistons themselves have some carbon on top of them. I was wondering what the best way to just clean up the top of the pistons and the very top of the cyl are?

I'm not going to drop the pistons out and hone it. The factoy hone marks are still there and the sleves look 100% perfect. Thanks!