Ken said:

Russell,

We routinely used ultrasonic cleaning (in isopropyl alchohol) of PCB
assemblies for the emulator and programmer products we used to make for
Philips/NXP.

Among other things they had HC18 low-profile style crystals of varying
frequencies including 11.0592 MHz, 12.0000 MHz, 14.7456 MHz, 16.0000 MHz,
and 48.0000 MHz (the latter being a 3rd overtone part) from a number of
different manufacturers.

We never had any problems with those either at production or in the field
(over maybe 1,500 units).  Our ultrasonic cleaning bath was only small (5
litres) and probably relatively low-powered  - but did a very good job.
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