Geof,
No Im not, it was just you saying you wrap them in foil. What I do is, clean as normal over the button as well, then dab them with white kitchen roll to absorb as much moisture as possible and if I feel it neccesary leave a little tab of kitchen roll behind each button, to be removed when the back is dry. Dont be alarmed at my question Geof, and Im not suggesting you are anything but professional, but, you might be surprised just what areas of a suite some CCs regularly miss out altogether. Carpets too, like the two guys in partnership I came across a couple of years ago on a course, who were astounded that the rest of us bothered to clean the riser part of stairs, as they admitted they didnt.
Dave.