Using CA On Clear Plastic Windows/Canopies
The odorless will not fog the canopy.
If you really want the best canopy glue of all, try PFM. It was marketed by Innovative Model Products. PFM was a hobby product which was really only a repackaging of a product called E6000. I have found E6000 to be available at craft stores. This stuff looks like silicone but smells entirely different and is much better as an adhesive than silicone. When dry, it is very tough yet remains somewhat flexible. Great stuff.
I once had a P-39 which had a canopy glued on with PFM to the monokote covering on the fuselage. This plane went straight into the ground at well over 100mph. The impact folded the fuselage(and the canopy) like an accordion yet the canopy stayed stuck to the monokote without letting go at all. I too once used R/C 56 until I discovered PFM/E6000.