Advice,
if you have a plastic rear window and intend to polish the rear window with a power drill and
clear plastic window polish kit, make it a point to tape off the edge of the window and cover the whole top with newspaper .
otherwise you will have a whole new Raggtopp project on your hands...
and don't bother with a rechargeable drill, you'll need a plug in, lots of torque is needed.
p.s.
The best brush for the canvas top and buy another one for the edge of the wheel wells, side skirts and bumpers.
http://detailcity.com/oxo-good-grips-small-car-wash-brush.html