How do I prepare a car for long term storage?

I will be out of the country for three months at the end of the year and have to store my Mercedes-Benz CLK outdoors under a good sheltered car porch. Can you tell me which steps I need to take to prepare my car for storage?

Asked on 20 September 2013 by PeterMclean

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Much better second attempt at CLK. Goes well, handles well and is comfortable. Attractive looks.
 

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