Try RBS-35 Detergent Concentrate from Pierce at  I have been using it for years with great 
results.  Their claim is that this detergent is as good as chromic acid 

M. Rocio Sierra-Honigmann, MD, Ph.D.
Lab Director
Engineered Wound Repair Laboratory
Division of Plastic Surgery
Cedars Sinai Research Institute
Los Angeles, CA

On Feb 18, 2004, at 6:01 AM, Timothy R. Wheelock wrote:

> Hi Everyone:
> I have been using pure Nitric Acid for years to acid-clean glassware 
> for my 20% silver nitrate Bielschowsky stain.
> I would like to find a safer substitute for it.
> Any ideas?
> What do other people use to acid-clean their glassware?
> Thanks for any advice you can give.
> Tim Wheelock
> Brain Bank
> McLean Hospital
> Belmont MA
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