If it were me (and it will be someday when my silverguard needs it), I would soak it overnight in a bath tub starting out with warm water and mild detergent, like woolite - this will loosen most dirt, sap, etc.
Then, I would put it in a front load washer on gentle and cold, using maybe 1/8-1/4 the normal amount of detergent (since my washer is not front load, I'd stuff it in a garbage bag and take it to a laundromat w/ front loaders, along with some synthetic clothes - non-cotton like and wash them first to 'clean' out the machine, then the cover). Then line dry it.
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