Pledge....have used it on all my airplanes (metal and fabric) since the first one in 1973. After each flight mist the leading edge and windshield, immediately wipe. Bugs come off easily. When the tops of the wings get dusty, same deal. Simple Green Aircraft (or GoJo) for stains on the belly. Follow with a good wax job a couple times of year.

FWIW...YMMV!

Jim