Window tinting

Im always tinting windows on something so i thought it would be pretty cool to have a thread with some tips and tricks. Just from what little iv learned its a lot easier than it use to be but im still far from a pro at it. Everyone that has experience with it post up some info on it, stuff like the proper tools to use, differnt ways of doing stuff and something that i need help with is what to spray on the tint, iv been using soap and water but its doesnt seem to work the best.