Mine stays outside and is used year round.
I wash/inspect roof quarterly. I use a beach towel to kneel on. Surprisingly all the mildew/pollen comes off with good brand car wash soap.
The rest of unit maybe 3 or 4 times a year.
For windshield, I use a scotch Brite and good stepladder. After I get love bugs and other guts off, I use Rain X. Even with bug wash in reservoir they still stick.
Last trip South I think the love bugs had a reunion on 29. My windshield was so bad I was afraid to use wipers and make it worse.
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