Before cleaning anything do a log of your MAF reading g/s from VCDS together with RPM at idle and when driving around. This should tell you if the MAF is faulty.
Lambdas usually have their own unique code so perhaps its not them.
I cleaned mine twice in Isopropyl aclohol left overnight with the metal element submersed in Isopropyl overnight in a little plastic bag. Make sure it is competely dry before putting back into car and starting. You can get it from Maplins it comes in a big spray can.
I also went a bit over the top and gently brushed the exposed metal element with a glassfibre brush (for cleaning electronics before soldering). This is to try to clean any oxidised deposits on the element surface. The MAF worked fine after this cleaning procedure and lasted around 4 years until it was stolen.
Here is my old error read out resulting from a bad MAF. I also had 1 bad lambda sensor.
5 Faults Found:
17539 - Oxygen (Lambda) Sensor; B2 S1: Internal Resistance too High
P1131 - 35-10 - - - Intermittent
17538 - Fuel Trim; Bank 2 (Mult): System too Lean
P1130 - 35-00 - -
17536 - Fuel Trim; Bank 1 (Mult): System too Lean
P1128 - 35-00 - -
16485 - Mass Air Flow Sensor (G70): Implausible Signal
P0101 - 35-00 - -
17545 - Fuel Trim: Bank 1 (Add): System too Rich
P1137 - 35-00 - -
Readiness: 0010 0101
And I aslo had the same load error for the ABS brakes and Auto Trans:
Address 03: ABS Brakes
and
Address 02: Auto Trans
1 Fault Found:
18265 - Load Signal: Error Message from ECU
P1857 - 35-00 - -
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