Very good question. My dad says no, I say yes. I take care of the F2 and my dad takes care of the F's. The F2 looks like it was just taken off the showroom floor. The main thing is not to spend too much time spraying the wrong areas such as bearings or places where water can get held up. My dad just blows the machines off every once in while with a long extension tube with a valve on it. Doesn't look bad but doesn't look great either. Soybean dust seems to stick to just about everything. I had a combine fire with the F2 about 8 years ago (rivets came out of a piece underneath the muffler and straw caught on fire) and somehow with my "heart stopped", I saved it with one good throw of gatorade and when my dad came I put the rest of it out with a fire extinguisher. Safety should always be first! There isn't one combine without a fire extinguisher now! We fixed it by putting small bolts with locknuts on it. There were smaller fires under the motor and on the motor by the dust of wheat chaff and soybean dust. Thus every year I give it a good powerwashing and never regret it. I have not noticed any difference in bearing replacement or anything like that. We have never had any problem with the other ones my dad spends half a day blowing off with air either though, but I still go for looks as well, plus I think when you blow it off, it's moving dust from one part to another. With water you can see it coming clean and it's much more powerful. Here are some hints I hope. Do what you want, but the main thing is at least do one or the other at least once or twice a year! 1.) Make sure clean grain_return_bin_concave bottoms are opened up with header in down position. 2.) Don't use too high of pressure or it will start removing paint_stickers_etc. (I use 1500 psi) 3.) Presoak the machine then start from the top and work down, it will save you time. 4.) Depending on how dirty it is, use degreaser first, soap, water, wax, then lightly rinse. 5.) Inspect for missed spots 6.) Run machine at idle for 10 minutes then full throttle for a minute with everything opened up. 7.) Change filters at this time (cab, engine, etc.) 8.) Wash the windows, foam the tires, wax. ;-) 9.) ENJOY!