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I created a firebase project and added an android application and did all the stuff to add this to my application in Android studio. Later I deleted the project and recreated a new one in firebase, the problem is, that I can't replace the data on any Device.

Removing the google-service.json file and any gradle dependancys, as if there was never any firebase related things implemented doesn't work. When I close Android Studio, reopen it, wipe the device and then add the dependancys the device still uses the old Key. How can I get rid of the old key? I already replaced the google-service.json or removed it complete, but the device still makes calls with the old key.  From where does it get the Key?