I just purchased a 1995 ES300 and I just found the door after pulling back the driver side carpet. Saw the white plastic wall to the right of the gas pedal and began removing the two "Mickey Mouse" plastic black phillip's head screws. I found the thin white filter door at the back and un-clipped that.NO FILTER either! What the heck? Can't even stick my small hand inside to remove debris! I used a vacuum, but the door opening is elongated and so I got no suction from the vacuum. I tried a stick and screw driver to try and remove debris, but good luck with that. I will have to go to the gas station and try and blow the debris out. Even being a small guy (5'2") I don't see how an engineer designed this and expected anyone to maintain it?
I attached a cardboard paper towel roll to the vacuum nozzle with duct tape. Then squeezed it flat and stuck it in the filter slot. Being careful not to scrape the back of the AC aluminium fins. This worked great.
Here is a link to the installation pictures that I took.
https://www.dropbox.com/sh/btsoxu3yyxnq7r2/AADA1Klye2tJASEe7gx63N59a
P.S:
You can purchase the filter from several places on the internet. But these guys are really good. Plus, the site is easy to find everything for your Lexus!
http://www.rockauto.com/
FILTER:
http://www.rockauto.com/catalog/moreinfo.php?pk=870159&cc=1316093