Just curious - where's the antenna or sensor that receives the signal from outside the car?

Both keys are clean on the ends - can I clean the ignition switch receiver with a q-tip and alcohol?

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport