Portable ultrasonic contact lens cleaner.
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Previously:
https://www.homemadetools.net/forum/...549#post197253
https://www.homemadetools.net/forum/...082#post195283
https://www.homemadetools.net/forum/...636#post186096
https://www.homemadetools.net/forum/...056#post137991
https://www.homemadetools.net/forum/...600#post189766
