On Thu, 11 Apr 2019 11:16:50 -0700 (PDT), wrote:

When working/repairing pvc pipe is it really necessary to use the blue pvc cleaner? Please advise Herb

You can use the clear in the yellow can but if it is being inspected
they want to see a little purple ring on the pipe at the joint. The
cleaner/primer does make the joint much stronger. It breaks the
surface oxidation and allows the cement to penetrate better,