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I am talking about the ones in your house as well if you haven't changed them each month during the winter.
But, more to the point about the S. Time to change the cabin air filter after a long winter with the top up. To be honest, if it wasn't for this site, I wouldn't even have known our car had a cabin air filter. I changed mine this morning (all of 10 minutes) and here is a picture of what came out and what went in: