The side front windows on my 2014 Toyota Highlander fog up in the humidity
Your Highlander Limited Platinum has heated mirrors. Do you have the owners manual? You say windows and mirrors...both?
http://www.toyota.com/t3Portal/document/om/OM48A12U/pdf/sec_06-01.pdf download that and see page 424 - 426, it shows how to defrost/defog both
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