"IMPORTANT RULE, at least once a week, 52 weeks of the year, run it as per recommended start up etc. for at least ONE HOUR. Helps in reducing blockages, and refreshes some of the stagnant water."
Zero, at the end of each summer when I put the covers on mums air conditioner I I give the water tray a wipe, turn water of and drain.
As a precaution I will add some disinfectant to the water when I take the covers off and turn the water on at the beginning of summer
