Wash outdoor windows with Woolite. I have been doing this for years and found a blog with photos. I use 1/2 cup to 1 gallon warm water, but other than that I do the same as this blogger using a soft car washing brush on an extension handle. Makes outdoor window cleaning easy.
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While hanging our faux brick panels up in the playroom/guest room I happened to look down and see the grotesque window tracks. I remembered that I hadn't cleaned this particular window when we moved in over two years ago, since this room wasn't going to be used that much.