How to delete Bluetooth devices from Tmo Galaxy S3?

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http://forums.androidcentral.com – I have searched on how to remove devices and keep finding the usual "press and hold device until menu pops up". Well that does not work on a T-Mobile S3. I paired with my wife's car, my truck, and headset. I rarely drive my car and every time in get in it alerts me every 2 mins or so "confirm passkey to pair with the device". I do not have the option to turn off, just to pair it or cancel, and cancel only allow it to alert again in 30 seconds or so. I have "unpaired", rebooted (it is gone) but that does not stop it from returning when I enter her car. On older And (HowTos)