Using these OLM mirrors is a breeze. Just replace your old stock mirrors with these new ones as they are direct replacements. For defrosting, turn on your vehicle's defroster function, and the heating element in the mirrors will start working. When it comes to cleaning, use a soft cloth and a mild glass cleaner. Avoid using abrasive materials as they can scratch the mirror surface. Also, make sure to check the connections periodically to ensure the heating element works properly. Keep them clean and well - maintained, and they'll serve you well for a long time.