Spray the cleaner onto a soft, lint-free cloth. To avoid damaging the mirror surface, it's better to spray the cloth rather than the glass itself.
Wipe the mirror surface using even strokes. Polish any particularly tough spots by gently scrubbing the spot with the soft cloth.
Dry the mirror by wiping it down with a dry, soft, lint-free cloth. Dry all of the mirror's edges; moisture build-up in these areas can cause a black edge over time. Dry the joints between folding or adjoining mirrors to ensure all wetness is absorbed.
Fill a shallow bin with clean, warm water. Do not add soap or any additional substance.
Place a soft, lint-free cloth into the water. Remove the cloth from the water and wring it out.
Wipe the mirror with the damp cloth. Use a gentle motion overall, and apply more pressure to spots that require additional cleaning.
Dry the mirror with a second soft, lint-free cloth that is dry and clean. Wipe the whole mirror, paying particular attention to the edges and joints and making sure all moisture has been absorbed.