Bingo,
I use an oil absorbent pad to get most of the heavy gunk. After that, 409 or windex is easy. Usually only one or two towels required. (You can get the oil absorbent pads at some auto supply stores and through most industrial supply houses. They're about 2 ft square and are usually used to absorb oil spilled during repairs. I take one and cut it into about 8 pieces. You can use them many times before you need a new one.)

papermache