Medallion is also quite good for use by hand. It's the strongest cleaner Meg's makes for use by hand.
Just a tidbit, not meant to be contrary advice. It's a heck of a lot better to use MPPC by PC, and as mentioned ScratchX is hand-use only.
From Rod Kraft: In order of strength, strongest to mildest, MPPC, ScratchX, #9.
I'm thinking that that's not the whole story, though. That doesn't mean they all work the same way. #9 by machine might do more work than ScratchX by hand, but ScratchX by hand might do more work than #9 by hand.
Tom