Use a razor blade on the windows to get the stickser off. The get some paint thinner on a rag to wipe to glue and whats left off.

For the body, use a credit car (or some other plastic card) and then use somebrake parts cleaner to remove any and all left over adhesize. Then wipe it down REALLY good and wax wherever the brake cleaner touched!Or wash your can and do the usual routine.