Anyone know how many applicators I might need to do all the windows including the hardtop windows on 2012 (really 2007-2012) Jeep Wrangler Unlimited (4 door)? After cleaning her up from an off-road trip on Monday I noticed the windows are full of water spots again. I assume from the water from my hose drying before I was finished washing the vehicle. I guess we have hard water in the area. I'm hoping the aquapel will cut down on or eliminate spotting.