I use the smooth creamy (Not Gritty) mechanics hand cleaner that comes in a small plastic round tub
and the top pops off. Since I was at the auto store anyways, I got a different brand the last time, but
I think it's called DL when I pick it up at Wal-Mart. It's "Not" water base which is what you want. Years
back, an old time collector adviced it and I liked and used it ever since..
Not to get into details, but without the vacuum itself touching the playfield, I first vacuum the area I'm
about to clean, cut about an inch off the M.E. (Magic Eraser) pad, use the hand cleaner as a dip for the M.E.,
and rub it in circles on the playfield. Maybe a soft cloth would be best, but I just use a piece of paper towel
to clean off, and then vacuum the light sockets and rollover opens to suck up any hand cleaner that might
have gotten inside. Once the entire playfield has been cleaned, I apply the wax (Mothers Liquid Cardnoba)..
Small story. A while back, someone dropped off their dirty dead Fun Park. Most dirty playfield I've ever seen.
M.E. wouldn't do it, so I took a chance with Scotch Brite soaked with the hand cleaner, and got 90% of the
filth off without fading any of the art. For me, the hand cleaner is cheap, not water base, and gives positive
results..