Update: Well Jim, you were correct: The aftermarket rear wiper blades are garbage vs. the genuine article from Lexus. Once temps here finally rose above freezing I was able to remove, clean, lube and reinstall the rear wiper arm and blade assembly - with little to no improvement in effectiveness.
Went to Lexus and purchased a new blade. Both blade assemblies looked exactly the same, but right away I could feel the difference between the two blades as I had both lying on the counter: The after-market blade assembly exhibited stiffness in the joints that support the wiper strip. The Lexus b