Can anyone out there shed any light on how to clean the said item?.I've just changed from a Ramair filter to an ITG item and would like to make sure that the oil from the Ramair has not contaminated the sensor.

Very carefully.. lol

You could try distilled water...slightly warm...

Or a very weak solvent cleaner...and gently clean it...

I've heard of people spraying solvent cleaner into the AFM with the engine running...and claimed it makes the engine run and idle smoother... they claimed it takes 3 attempts (with the solvent spray)...

J.