I've had some wierd discoloration on the rear side glass.

I discovered this to be caused by a kid's toy. The toy is pretty much any of those sticky-gooey slimey type things. Some are in the shape of something, some are just shapeless goo.

Anyway, these always seem to find themselves onto the side glass. They leave it discolored.

Window cleaner does not remove this unfortunately. I found that WD40 does. I then used an aerosol glass cleaner to get the WD40 off.

I do not have any aftermarket tint, so I don't know what this would do to that.

 

You don't just duct tape yours to the seat like I do?