Great thread you've started here, hopefully I'll save £220 by just cleaning, failing that you'll have helped me save £130 by just buying the sensor.
2007 GT 3.2 V6.
MAF housing - 0281 002 533
Bosch sensor - F00C 2G2 063
I can't seem to find a Vauxhall Bosch alternative that's any cheaper than approx £90 for an Alfa Bosch one.
I've had the sensor soaking in 70% Isopropyl Alcohol for 15 mins, it's either going to completely ruin the sensor, make it work or make no difference. Worth a try for £4.