Chromatography Forum

But without them you would no place to stand.

Rod

Have you tried chromic acid cleaning solution? I seem to remember that it does a nice job on glassware. There's also a discussion in this document about removing grease.

http://www.sigmaaldrich.com/etc/mediali ... _al228.pdf

Aldrich document: AL-228

1. Chromic acid cleaning solution - Use powdered commercial or technical grade sodium dichromate or potassium dichromate.
If the compound is in the form of crystals, grind to a fine powder in a mortar. To 20 grams of the powder in a liter beaker, add a
little water, sufficient to make a thin paste. Slowly add approximately 300mL of commercial concentrated sulfuric acid, stirring well.
Transfer to a glass-stoppered bottle.

Use powdered commercial or technical grade sodium dichromate or potassium dichromate.

This is nasty stuff. Before trying this, consult the MSDS and take all necessary precautions!!!!!!

Use powdered commercial or technical grade sodium dichromate or potassium dichromate.

This is nasty stuff. Before trying this, consult the MSDS and take all necessary precautions!!!!!!

I think it's nastier once dissolved in the sulfuric acid. We don't use this any longer.

Instead of the carcinogenic chromic acid, try NoChromix if interested in a very thorough clean. Its worked well for me and is much safer than chromic acid. It does activate the glass surface.