My experience with extremely hard well water is vinegar to remove
residue from coffee maker and cooking utensils, muriatic acid to clean
toilet bowels ...

Roger Shile

-----Original Message-----
From: mems-talk-bounces+rshile=nanoink.net@memsnet.org
[mailto:mems-talk-bounces+rshile=nanoink.net@memsnet.org] On Behalf Of
Ruiz, Marcos Daniel (SENCOE)
Sent: Monday, June 13, 2011 10:13 AM
To: General MEMS discussion; mems-talk@memsnet.org
Subject: [mems-talk] Contact-free cleaning of limestone on
FS/Ta2O5substrates

Unfortunately, dried liquid residue (water spots) is notoriously
difficult to remove.  I would recommend Summa Clean (basically a soapy
mixture) and agitation in a megasonic or ultrasonic tank - as aggressive
as your samples can handle.

Dan Ruiz