Previously had an Harley Davidson for 8 years, I couldn’t be arsed polishing it, but I washed it a few times a year.
My washing procedure was to completely soak it with hose/cold water to remove any grit etc. Then wash with soft mitt in bucket of hot water mixed with turtle wax/wash. Then rinse off with hose/cold water and dry with air blower thingy.
After 8 years it still looked like new. I never covered any part up and never used a pressure washer but completely soaked the switch gear and Garmin Zumo GPS satnav holder. The way I see it, they gotta be water proof and surely Triumph switches etc are as good as Harley.
I just found this video of someone showing how to clean a Rocket 3..