For the first one, you might say, for example: There's moisture in your breath, so to clean your glasses, blow on the lenses and then wipe them with something. For the second one, you might say, for example: A steamed-up mirror will clear up on its own as the moisture evaporates.
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AnonymousBlow hot steam out of your mouth on the glasses and wipe with a cloth.Breathe on the lenses and wipe them with a cloth.
AnonymousThe steamy mirror will evaporate.I hope not! You won't have a mirror any more if it evaporates!