There's a long G73 touchpad thread (it eventually morphed into a G73/74 thread), where people posted images of their G73 TP cleanups as that method developed. I think it's
this thread....you'll have to browse around to find the photos. IIRC, it was last Spring, about March or April.
Some people removed just the tape and residue around the edges, while others removed the foil backing as well.