For at least the past year, my Tahoe has had something dripping out from between the rear glass and hatch. I have cleaned multiple times with 3D APC, HD TOTAL, and other cleaners in the area the drippage comes from, but it won't go away permanently. The rear hatch/glass was replaced in 2005 due to an accident, which was probably about 15,000 miles ago (The car only has 66,000 miles.) This car sits in the garage and is usually driven maybe once a week, so it doesn't even have any time to collect whatever this is; I know it is coming from the car and it isn't something from outside. It is also sticky enough to the point that clay doesn't even touch it. If I let it sit for a while, the area has to be polished. Here is a picture of the drippage:
Does anyone else with a Tahoe, Yukon, Suburban, or Escalade have this issue?

Does anyone else with a Tahoe, Yukon, Suburban, or Escalade have this issue?