I believe by 'igniter' they mean the actual circuit for the airbag (i.e. steering wheel end of it). You'd probably need to take the steering wheel off to get to the connector to clean it effectively. If it's anything like a passat then there will be a ribbon/coil thing to let the airbag stay connected when the wheel turns, that may be damaged/split I guess. I'm not familiar with the loom layout for that in the Golf, so I cant comment what other weak points there may be.