If you wanted to clean caliper, you'll have to remove muffler to get caliper off swingarm. The sliding pin bolts will bump into muffler and won't let you remove caliper. Should also remove the sliding sleeves from caliper, clean and grease with hi-temp silicone grease. This is more important maintenance than lubing piston to pad interface. Your original video shows proper procedure.
Also don't use little L-shaped allen keys or combo tools. Get set of allen-key sockets so you can use ratchet wrench for stability and adequate torque.
Also don't use little L-shaped allen keys or combo tools. Get set of allen-key sockets so you can use ratchet wrench for stability and adequate torque.