In the summer of 2010 when my Lexus 2008 IS 350 was around 25k miles, I checked and replaced my air filter and cabin air filter filter for the first time. 2+ years later, with my vehicle now around 63k miles, I have checked and cleaned my Blitz Engine Air Filter and Blitz Cabin Air Filter (also known as Hybrid, Pollen, and A/C Filter). I should have checked these filters much sooner but didn’t. The Blitz A/C filter is definitely re-usable, but the Blitz Engine Air Filter I’m not too sure about. I had read somewhere that it could be cleaned and re-used once.
I have a write-up in clublexus on a relevant thread regarding this which is worth taking a look. Here are some pics: