The last time my radiator was removed/cleaned was 2 years ago when the motor was changed. Since then I've been very diligent staying on top of routinely cleaning, e.g. spraying with degreasers, cleaning foams, Simple Green, reaching in with pressure washer, etc. I've been cleaning it "in the bike" probably 3-4 times a year. Towards the end of this riding season I noticed the temp would climb higher and sooner than anticipated. At idle and/or in traffic it would jump up a couple of bars in no time at all. This past weekend I decided to pull/flush/power wash the radiator. It's really not a big/difficult job. As a matter-of-fact it took me about 25 minutes to get the radiator out. On the bench I removed the shroud and fan. Shining a light through the radiator revealed the lower half was blocked at least 50% or more with debris, e.g. small rocks, tar, sand, dirt, bugs, etc. I drenched the radiator with degreaser and let it soak for about 15 minutes before I fired up the pressure washer. I directed the pressure from the back-side, of course. I was amazed at how much 'junk' came of the radiator on to the cement driveway. So much so that I repeated the spray/soak/pressure wash a second time. The inside of the radiator appeared to be fine. The old radiator fluid looked brand new there was absolutely no debris. I reinstalled and filled the radiator with Peak European OET fluid and added 4 ounces of Hyper Lube Super Coolant additive. It took the better part of a day to bleed the coolant system. I started by running motor, opening/closing both bleed screws (one on the water pump and the other above the left side hose). Bleeding didn't get very much air out. The whole time the bike was running air bubbles were rising into the coolant over-flow reservoir. When the fan kicked in I shut the bike down. I then topped off the reservoir. I let the bike cool down completely. When I came back out to the garage an hour or so later the reservoir was empty. I topped it off and repeated, e.g. start bike, bleed, fan turn on, shut down. I did this 4 complete cycles. After the 4th there were no more bubbles rising and the reservoir remained full. I should mention that by the 4th time the fan would NOT kick on, bike would get to a certain temp and just stay there... I'm happy with the results. I will now add radiator removal/cleaning to my Annual list, e.g. flush brakes, remove/inspect driveshaft, replace final drive fluid, etc.