also, for what it's worth, apparently no es 250 or es300 models has the karman vortex airflow sensor per the below link. i would conclude that all the other models, including the RX, has it but i know i've seen posts that says they've used the CRC cleaner so i am not sure if the article in inaccurate or if the cleaner really doesn't affect KV air flow sensors as much as someone might worry.

http://www.craftautoparts.com/karman...w_sensors.html

Your fine. Just clean the sensor. It will do more good than harm if you clean it properly