Just about anywhere. Look for Invisible Glass, the product name. Stoner's is the Manufacturer. I use it and it works grear.

 

yah stoners is good stuff

 

+1 Stoners...Dont get high..

 

I can hear the moans already but here is what I do. This works great on the outside, gets all the bugs off. Also, this is also recommended by many auto detailers.

Spray a liberal amount of glass cleaner on the windshield, enough that it is running. This is called flooding it. Then go over it with the finest steel wool you can find (usually #0000). Make sure the windshield doesn't dry out and don't put much pressure on the steel wool. I go in circles like I'm waxing it. Spray more glass cleaner on and wash it as normal. Next, I go over the glass with Turtle Wax Ice quick detailer. This removes any streaks from the glass. Next, I use Rain-X on it. Your glass will be so clean you swear it isn't there. I do this on the inside as well with the exception of the Rain-X. Don't use steel wool on the inside of tinted glass!!!!!

 

I use Gunk window cleaner foam from WalMart.
Ya, the inside of my windshield needs to be cleaned every week. No smoking either.

 

Thanks everybody

 

I've tried it all. Original Windex works the best.

 

Use newspaper for rubbing cleaners on/off windowsinstead of paper towels, cheaper than microfibers and is streak free.

 

I've always heard you shouldn't use ammonia based products on tinted windows (this would of course include Windex). Other than that, it should be fine though.

 

I use Eagle One 20/20 Perfect Vision. Ammonia free, safe on tintand really does a good job actually cleaning off bugs and other dirt without alot of scrubbing and dries streak free.