Following on from my recent threads re MAF problems, and all but eliminating this as the cause, ie new one bought but still same problem. Someone suggested that some of the crappy octane booster could have stuck itself to the lambda sensor.

is there anyway of cleaning this easily?

 

Lambda sensors are not happy with foreign chemicals. There's no real way to clean these because the sensor surface is actually protected by a shield (the metal bit which you see as the tip).