I keep the F11 on our rig, definitely once a year, sometimes twice.
Bugs come off easier, and most of the time, a good strong rinse cleans the surface without a wash mitt or soft brush.
Of course, this is all personal preference, whatever works for one, may not meet another's expectations.
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2020 MHC 330RL
2021 F350 DRW 6.7 Powerstroke
Retired and Rollin'!
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