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These systems use an antenna in both the front and rear windows. There is a wire that clips onto the glass for each. In the front, you'll find it towards the passenger side, close to the headliner. On the rear, IIRC it'* on the driver side. Although unlikely, just make sure these are fastened securely. It is possible they may have dislodged while cleaning the glass. There are several other possibilities, some of which I'll describe.
There is an antenna module which is just above the headliner in front of the rear glass. This may be defective or there may be a wiring problem between it and the radio. Likewise, you could have a connection problem between the antennas and the module, or the module and the antenna input on the radio. Except for a single inline connector under the dash pad on the passenger side, the coax is a single, uninterrupted cable all the way from the antenna module to the radio.
It'* possible that the radio may be bad. The radio may not be turning on the antenna module. The module is not always on by default, but is controlled by the radio. It also varies in function based on whether AM or FM is selected.
These can be difficult to troubleshoot. The best way to "quickly" diagnose is to use a Tech 2 scan tool. This is the only one which will actually talk to all these components properly. Unfortunately, other than a dealership most shops won't have one.
My best guess (unless you've recently had work done where connections may have been disturbed) is the antenna module in the roof. Some other members have had problems with the connection on the back of the radio if it has been removed and reinstalled. Here'* a link you can check out which may provide further assistance: