Using the wrong solution can damage your 3DS.
Seeing someone clean their Nintendo 3DS screen with a rubbing alcohol wipe inspired me to promote a safer way to clean that device.
Rubbing Alcohol should never be used to clean an electronic device -- because it's flammable, and can discolor your device.
Out of all of the electronic cleaning solutions that I've tried, I found Antec Advance 3X Strength Cleaning Spray to be the best, because it's formula doesn't leave streaks, kills 99.9% of bacteria for over 24 hours, and is alcohol and ammonia-free.
You can find an Antec Advance 3X Strength Cleaning Spray bundle (as pictured on the right) on Amazon.com for a reasonable price. That bundle includes:
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One 60 mL bottle of cleaning spray.
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One 240 mL bottle of cleaning spray.
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One 11.8" x 11.8" (30 cm x 30 cm) microfiber cloth.
Alternatively, Antec are also selling disposable Advance 3X Strength Cleaning Wipes.