We've not had any problem with buildup in ours either and we let it run weeks/months at a time. We do wipe it down occasionally when it runs out of water. We do not use tap water even though it is filtered. We only use bottled water in it.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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