I used Taylor diesel in Stoney creek for a K75 years ago. They visually check the spray pattern, but did not provide me with an actual test (ie flow rate, particle size etc). The bike was 20 years old so I figured it wouldn't hurt, it was less than $100 for 3 injectors. There was no noticeable change in performance after cleaning.
What have you done to your poor 636 that requires the injectors to be cleaned already?