When I take it out it does go on long trips. I only put about 15 liters of gas in it at a time so it's never older than about a month or 2.

I cannot tell you the exact mileage per year, but each time it comes out I put at the least 30-40 miles, at times up to 100+ miles, and it never goes more than 3 weeks between drives.

I do assume it's carboned up though. Is there a way I can clean it? I saw some videos on youtube where something is sprayed into the combustion chamber via the spark plug hole, then it foams up, and it is taken out via high pressure air.

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010