Place one of these on each passenger door sill and enforce it ! LOL
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I concur. My old M had nearly 100k miles and the seats worked perfectly warm and cool. The perforated seats are known for accumulating dirt, skin oils, skin lotions, and assorted dirt and oils from clothing - esp blue jeans. However, if you clean the seats thoroughly on a regular basis, this will not become an issue. You can vacuum the perforated areas or simply steam the seats like I do a couple times per year.
You also must replace the fan filters (located under the seats). I change my cabin air filter ($15) and both seat filters ($20 each) yearly and they actually DO get soiled.
http://www.partsgeek.com/catalog/2009/i ... ilter.html
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http://www.ebay.com/itm/NEW-Infiniti-Pr ... d7&vxp=mtr