Question 1

Is the 500ml tank big enough for my needs, like cleaning a full pair of glasses?**

Accepted Answer

Yes, but it's designed for smaller batches. Based on user feedback, the tank comfortably fits one complete pair of eyeglasses, several pieces of jewelry, or a watch with its bracelet detached. If you need to clean large tools or multiple large items simultaneously, you might want to consider a model with a larger tank.

Question 2

I've seen mixed opinions online. Is it safe for my waterproof watch or delicate jewelry with gemstones?**

Accepted Answer

The ultrasonic waves are generally safe for most items, but caution is advised. Many watch enthusiasts use it successfully for metal bracelets and cases. However, we recommend **not** using it on waterproof watches to protect their internal seals, or on delicate gemstones like opals, pearls, or emeralds, as the vibrations can cause damage. When in doubt, consult your jeweler or watchmaker.

Question 3

What should I actually put in the tank—just water?**

Accepted Answer

You can start with warm water, and many users get good results for light cleaning. For better grease-cutting and stain removal, adding a few drops of mild dish soap or a specialized ultrasonic cleaning solution is highly recommended by experienced users. Avoid harsh chemicals. Using distilled water can also help prevent mineral buildup in the tank over time.

Question 4

How noisy is it during operation? I've seen comments about a loud hum.

Accepted Answer

It produces a noticeable high-frequency hum while running, which is typical for ultrasonic cleaners. Most users find it acceptable for short cycles (3-10 minutes) but note it can be distracting in a quiet room. If you plan to use it frequently in a shared living space or are sensitive to such noises, this is a factor to consider.

Question 5

This is my first ultrasonic cleaner. Who is this product best suited for?**

Accepted Answer

The Grundig UC 6620 is perfect for anyone looking for a convenient, low-effort way to maintain everyday items. It's a hit with eyeglass wearers, people cleaning simple metal jewelry, watch owners cleaning bracelets, and hobbyists (e.g., cleaning shaving razors, model parts, or small collectibles). It's less ideal for heavy restoration projects or cleaning very large, heavily soiled objects.

Grundig UC 6620 Ultrasonic Cleaner with Timer Function, High Efficiency Cleaning with Ultrasonic Dual Wave Principle, 500 ml Water Tank, 50 W Power, Integrated Watch Holder, White

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