Don't store XTOL with Dust-Off
You might be tempted to use Dust-Off (or a clone of it) to drive the oxygen out of a partially used bottle of XTOL. Well, I found the gas dissolves into XTOL and makes the XTOL more active. Here are the curves:
The bottle was 3/4 full, so only 1/4 was Dust-Off gas. XTOL's pH is unchanged, so Dust-Off is doing something else to the chemistry. And it's probably not what you want. The clone I use says it contains difluoroethane. Rudeofus warned me months ago that this is not inert. I should have heeded his warning.