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[russ86]

I rinse a watch under the running water and then use regular towel to dry it up.

[HogwldFLTR]

Originally Posted by challer

Wrong. The good ultrasonic cleaners come with, and you can buy, a stand that holds the body of the watch out of the cleaner. But that should be necessary but quarterly or so if you wear the watch daily. Otherwise, if you must, when washing your hands, take the watch off before hand and clean said watch with soapy hands. There is no need for a brush. Dawn is always preferred. The PT Rolex use is quite hard and scratches shouldn't be an issue. Over cleaning anything is just as bad as under cleaning.

Just because something comes with a stand doesn't mean it's a good idea; I'd err on the side of caution as ultrasonics can cause motion in the engine (especially of oils).

[challer]

Originally Posted by EEpro

That's a bit strong. Lee isn't wrong. Having a watch head stand doesn't make it a "good" ultrasonic cleaner. My professional Crest unit would wreck your watch head by coupling right through the bracelet.

The way you couple sonic energy into multiple pans containing different solutions is by allowing the bottom of a steel pan to contact the water bath below and voila a new ultrasonic bath is made.

It's actually the crappy little ones marketed for jewelry that have such features.

In hindsight, the tone was harsh, apologies. With respect, I buy Herrmann industrial ultrasonics for the manufacturing company I own. Your Crest and My Herrmann certainly will not hurt watch internals, particularly if held out of the bath. The wavelength just is not right to jump across the relatively loose joint that is the spring pin. Even head submerged, the ultrasonics don't have the energy to move the head. I've been doing it for years without issue and with the blessing of Herrmann.

I will say that ultrasonic cleaning results in truly filthy soapy water when done (annually, even with the Dawn and water every few days) and this is why I recommend it. No brush is going to get where the filth is.

I do have a bias against those who feel these Rolex are delicate flowers. They are not. I regularly use my watches in what many here would consider sacrilegious abuse without cause and when service has come around, no issues. I also never polish a case.

If someone can present the case of two identical watches, one cleaned ultrasonically, one control, and for which there is damage, I will stand corrected. On the other hand, many people here admit to damaging the watch head during removal and installation of the band.

[EEpro]

Originally Posted by challer

In hindsight, the tone was harsh, apologies. With respect, I buy Herrmann industrial ultrasonics for the manufacturing company I own. Your Crest and My Herrmann certainly will not hurt watch internals, particularly if held out of the bath. The wavelength just is not right to jump across the relatively loose joint that is the spring pin. Even head submerged, the ultrasonics don't have the energy to move the head. I've been doing it for years without issue and with the blessing of Herrmann.

I will say that ultrasonic cleaning results in truly filthy soapy water when done (annually, even with the Dawn and water every few days) and this is why I recommend it. No brush is going to get where the filth is.

I do have a bias against those who feel these Rolex are delicate flowers. They are not. I regularly use my watches in what many here would consider sacrilegious abuse without cause and when service has come around, no issues. I also never polish a case.

If someone can present the case of two identical watches, one cleaned ultrasonically, one control, and for which there is damage, I will stand corrected. On the other hand, many people here admit to damaging the watch head during removal and installation of the band.

No disagreement on risk damaging the watch head. My Overseas bracelet is a blessing that way.

You don't think there is sufficient energy coupling at 45 - 130 kHz (with chirped freq practically begging to excite a resonant frequency if one exists) to displace the oil on the surface of parts like the pivot? With just a little nudge capillary action will then drag the oil droplet to the wrong location.

That's one hypothesis as well as the whole powerful magnets near the watch head issue.

It would be great to have a real study done. Trust me I'd love to toss it in whole if it was proven safe.

[challer]

Originally Posted by EEpro

No disagreement on risk damaging the watch head. My Overseas bracelet is a blessing that way.

You don't think there is sufficient energy coupling at 45 - 130 kHz (with chirped freq practically begging to excite a resonant frequency if one exists) to displace the oil on the surface of parts like the pivot? With just a little nudge capillary action will then drag the oil droplet to the wrong location.

That's one hypothesis as well as the whole powerful magnets near the watch head issue.

It would be great to have a real study done. Trust me I'd love to toss it in whole if it was proven safe.

I'm in. My analysis and that of Herrmann is no, it cannot, not energy, wavelength across the spring pin is the thing. But if it's otherwise, let's all find out. How do we fund two (or more) control watches here? I will trust you are/can be a trusted test facility as I am biased and you seem to know the science. Who else is in? This question comes up all the time. I'll commit $200 right now