Is this any good for cleaning greasy eyeglasses?

A couple reviews were misleading. Here's the guidance straight from the manual on this question and it was bolded: "ATTENTION: - Glasses / Sunglasses with pre-existing scratches or cracks in the coating are not suitable for ultrasonic cleaning. Ultrasonic cleaning is only suitable for cleaning frames. - Antique jewelry, jewelry containing loose stones, and jewelry containing soft / porous stones like pearls, emeralds, amber and opal should not be cleaned in the ultrasonic cleaner. If you are unsure about whether you should use the ultrasonic cleaner on your specific type of jewelry, please consult your local jeweler." I ruined a pair of glasses. If you have even the slightest, think almost invisible, crack in the coating or a break in it where the lenses meet the frames (very hard to detect), the ultrasonic cleaner will vigorously attack these defects and start to strip away the entire coating, thereby trashing your glasses. If your lenses are COATED with anything, follow the manufacturer's advice and do not use an ultrasonic cleaner.

The manual calls "to celan watches with less than 30 mts of watterproof depth " does this mean that if I have a 50 mts it is not suitable?

The short answer is that regardless of the mis-worded/backwards instructions in the manual, you should never ever submerge any watch in an ultrasonic cleaner, period. The entire purpose of the ultrasonic cleaner is to aggressively drive water into the tiniest of crevices to clean out debris. The sealing gaskets for watches are not designed with ultrasonic cleaners in mind. Even diving watches are not tested against such aggressive environments. The ratings on non-diving watches are for brief submersions in static environments when brand new. With age the o-rings degrade. The seal around the stem isn't very tight to start with, and after a battery change the seal for the back is rarely very robust. No watch maker is likely to endorse using an ultrasonic cleaner on their watch. For more info on what the rating on the watch means, look at: https://en.wikipedia.org/wiki/Water_Resistant_mark

What are 5 preset cleaning cycles?

Preset cleaning cycles is a fancy term for how many seconds the machine is set to run - 90, 180, 280, 380 and 480 seconds.

anyone have a solution that they think i should use for this for best answers

I use Simple Green or Fast Orange combined with warm (not hot) water in a 50/50 ration. This works best (for me) over any other cleaning solution combo for jewelry. I then rinse in clean water and use a can of compressed air (the kind you use for computer keyboards) to blow dry diamonds and give it that extra sparkle.

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✨ Clean smarter, shine brighter with ultrasonic power! 🔊

CUSTOMIZABLE DIGITAL TIMER - Choose from 5 precise cleaning cycles (90-480 seconds) with an easy-to-read display and auto shut-off.
ECO FRIENDLY CHEMICAL FREE - Cleans using only tap water—no harsh chemicals, protecting your valuables and the planet.
VERSATILE MULTI ITEM CLEANER - Perfect for jewelry, eyeglasses, coins, dental tools, and more—professional results at home.
PROFESSIONAL GRADE ULTRASONIC CLEANING - Harnesses 42,000 Hz sound waves to blast away grime with microscopic bubbles for a spotless shine.
SPACIOUS DURABLE STAINLESS STEEL TANK - Generous 20 oz capacity fits multiple items safely, built to resist corrosion and scratches.

The Magnasonic Professional Ultrasonic Jewelry Cleaner (MGUC500) uses advanced 42,000 Hz ultrasonic technology to generate millions of microscopic bubbles that gently yet effectively remove dirt and grime. Featuring a durable 20 oz stainless steel tank and a digital timer with 5 preset cycles, it offers customizable, chemical-free cleaning for jewelry, eyeglasses, coins, and more—delivering professional-grade results conveniently at home.

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