In the world of fine timepieces, an automatic watch is more than just a tool for telling time—it represents a fusion of craftsmanship, precision engineering, and personal expression. Yet, as time passes, even the most meticulously cared-for watches can accumulate dust, sweat, skin oils, and ambient residue that dull their appearance and affect their hygiene. Ultrasonic cleaning, known for its ability to restore brilliance to metal surfaces, has emerged as a favored method for deep cleaning jewelry and tools alike.
When it comes to automatic watches, however, this method calls for a more thoughtful approach. Understanding which parts can be safely cleaned and how to use ultrasonic technology properly is key to maintaining both the visual appeal and inner mechanics of these intricate devices.
Understanding Ultrasonic Cleaning for Watches
Ultrasonic cleaning operates through a process called cavitation, where high-frequency sound waves (usually 40kHz or more) create microscopic bubbles in a liquid. These bubbles collapse rapidly, releasing localized energy that gently dislodges dirt, grime, and contaminants from surfaces. It’s especially effective in reaching small crevices, including between watch bracelet links or under the clasp—areas where toothbrushes or cloths simply can’t reach.
What makes ultrasonic cleaning so appealing is that it’s non-abrasive and doesn’t require scrubbing. But while it’s perfect for metal bands and certain waterproof components, complications arise when we talk about the internal mechanism of an automatic watch.
Can You Submerge the Whole Watch?
Here’s where caution comes in. The general consensus among horology professionals is: do not place the entire automatic watch—including its case and internal movement—into an ultrasonic cleaner. Why?
While many watches are marketed as “water-resistant,” that doesn’t mean they are fully sealed against the high-energy cavitation that occurs during ultrasonic cleaning. Vibrations can interfere with the balance wheel or even force moisture past the gaskets. In worse cases, ultrasonic waves may disrupt fine lubricants inside the movement, potentially impacting long-term accuracy.
Instead, detach the bracelet from the case and clean it separately in the ultrasonic tank. Use a soft cloth or a specialized brush to clean the case manually, avoiding contact with the crown and seals unless you’re a trained technician.
Best Practices for Cleaning Automatic Watch Parts
If you’re planning to clean your automatic watch safely, consider this step-by-step guideline:
Start by removing the bracelet. Most spring bars can be released with a fine tool.
Place the bracelet in the ultrasonic cleaner using a stainless steel mesh basket or tray to prevent contact with the tank bottom.
Use a specialized watch-cleaning solution (never strong acids or household cleaners). Water-based, neutral pH solutions are typically safe for stainless steel.
Set the cleaner to run for 5–10 minutes, preferably at a moderate temperature (40–50°C).
After cleaning, rinse the bracelet in distilled water and dry it thoroughly with a microfiber cloth or compressed air.
Never place the case, movement, or dial into the ultrasonic cleaner unless you’re fully trained and the watch is disassembled.
The following is a video showing how to clean watch straps using a Guanbo ultrasonic cleaner for your reference:
Why Granbo Cleaners Are Ideal for Watch Cleaning
Granbo ultrasonic cleaners strike a perfect balance between professional performance and user safety. With adjustable temperature control, multi-frequency options, and soft-start degas mode, they’re engineered to support precise cleaning without compromising the structural integrity of your items.
For watchmakers and collectors, Granbo ultrasonic cleaners offer a reliable and refined solution for maintaining timepiece components. Whether it’s bracelets, bezels, or intricate screws, the machines provide gentle yet effective cleaning that preserves both structure and finish. With stable frequency output and built-in circuit protection, even delicate elements can be handled with precision and safety.
Granbo’s deep-cleaning performance is especially effective for reaching into narrow gaps where sweat, skin oils, and dust tend to accumulate. In just a few minutes—when used with the right cleaning solution—the ultrasonic process can restore the metal’s natural shine, all without resorting to abrasive scrubbing or complex disassembly.
Keeping Your Watch Brilliant Without Compromise
Automatic watches require both care and respect. While ultrasonic cleaners are excellent tools for removing tough grime and restoring shine, they should be used with selectivity and strategy. Focus on the parts that benefit from ultrasonic energy—bracelets, clasps, and loose external components—while keeping the movement safe from unintended damage.
When in doubt, consult a trusted watch technician or jeweler before undertaking ultrasonic cleaning. And always pair your cleaning practices with a reliable device—to ensure your timepieces remain as beautiful and precise as the day you acquired them.
