How to force a factory reset or hard reset on Motorola devices

Motorola DEFY Motorola DEFY
Motorola CITRUS WX445 Motorola CITRUS WX445
Motorola BRAVO MB520 Motorola BRAVO MB520
Motorola MOTO MT716 Motorola MOTO MT716
Motorola FLIPSIDE MB508 Motorola FLIPSIDE MB508
Motorola SPICE XT300 Motorola SPICE XT300
Motorola XT301 Motorola XT301
Motorola DROID PRO XT610 Motorola DROID PRO XT610
Motorola DROID 2 Global Motorola DROID 2 Global
Motorola MILESTONE 2 ME722 Motorola MILESTONE 2 ME722
Motorola MOTO ME525 Motorola MOTO ME525
Motorola DROID BIONIC XT865 Motorola DROID BIONIC XT865
Motorola DROID X ME811 Motorola DROID X ME811
Motorola DROID BIONIC XT875 Motorola DROID BIONIC XT875
Motorola Cliq 2 Motorola Cliq 2
Motorola ATRIX 4G Motorola ATRIX 4G
Motorola ATRIX Motorola ATRIX
Motorola XOOM MZ600 Motorola XOOM MZ600
Motorola XOOM MZ601 Motorola XOOM MZ601
Motorola XOOM MZ604 Motorola XOOM MZ604