This is a column I have both wanted to write, and been concerned about writing, for some time. I had intended to write it on the 10th anniversary of closing of the Montreal Protocol, but I was concerned that 10 years was not enough distance from the event to allow for a useful perspective. This is that column. It is about "cleaning times" in the early to mid-1990s during the chlorofluorocar-bon (CFC) phaseout. It's about how we got from the past to today in metal cleaning and what tomorrow might look like.
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