Recently cleaned up the HV Battery Fan of my Prius Alpha 2011 upgraded to 2015
the colour of the Fan is very misleading
it looks clean even if its very very dirty
we were planning not to clean it after having a look
but then applied a blower just bcz we had spent so much effort uncovering it
and then the whole car went smoke gray once the Blower was unleashed on it
it looked like it was never cleaned in Japan
I advise every1 to clean it once a year
wassalaam