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2. Coin cleaning - Wikipedia

   en.wikipedia.org/wiki/Coin_cleaning

   Coin cleaning is the controversial process of removing undesirable substances from a coin's surface in order to make it more attractive to potential buyers. The subject is disputed among the numismatic community whether cleaning coins is necessary. Those that argue in favor of cleaning are also in dispute on which methods work best.

3. Jewellery cleaning - Wikipedia

   en.wikipedia.org/wiki/Jewellery_cleaning

   Ultrasonic cleaner showing the removable basket in place, and a closeup of the light and timer Ultrasonic cleaners are useful for jewelry cleaning and removing tarnish. They use ultrasound waves and chemicals combined to create bubbles that "cling" to the foreign particles such as dirt, oil, and unknown substances.

4. Ultrasonic cleaning - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic_cleaning

   Ultrasonic cleaning is a process that uses ultrasound (usually from 20 to 40 kHz) to agitate a fluid, with a cleaning effect. Ultrasonic cleaners come in a variety of sizes, from small desktop units with an internal volume of less than 0.5 litres (0.13 US gal), to large industrial units with volumes approaching 1,000 litres (260 US gal).

5. Acoustic levitation - Wikipedia

   en.wikipedia.org/wiki/Acoustic_levitation

   Acoustic levitation is a method for suspending matter in air against gravity using acoustic radiation pressure from high intensity sound waves. [1] [2]It works on the same principles as acoustic tweezers by harnessing acoustic radiation forces.

6. Megasonic cleaning - Wikipedia

   en.wikipedia.org/wiki/Megasonic_cleaning

   It is a type of acoustic cleaning related to ultrasonic cleaning. Similar to ultrasonic cleaning , megasonic cleaning uses a transducer that sits on top of a piezoelectric substrate. [ 1 ] The transducer creates acoustic waves at a higher frequency (typically 0.8–2 MHz ) than ultrasonic cleaning (20-200 kHz ).

7. Remove Banner Ads with Ad-Free AOL Mail | AOL Products

   www.aol.com/products/utilities/ad-free-mail

   SYSTEM REQUIREMENTS. Mobile and desktop browsers: Works best with the latest version of Chrome, Edge, FireFox and Safari. Windows: Windows 7 and newer Mac: MacOS X and newer Note: Ad-Free AOL Mail ...