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I have the 2009 RX 350.
Do you know what is the white tank located under the car battery ?
I've asked this question in other forum but there was no good answer, so
I want to try it here.

Thanks in advance.

Here is the picture. The red arrow points to the tank in question. Air filter is top left. Radiator is on the right.
https://www.clublexus.com/forums/att...1&d=1257885844


Here's the close-up picture. Red arrow points to tank.
https://www.clublexus.com/forums/att...1&d=1257885844