you'll wear out and dry out the bushings on your suspension if you leave it decompressed. (particularly in the rear). No reason to jack it up, leave it on the wheels, if you have storage wheels you're set.
rags in tailpipe, air filter, etc is for mice.
also throw some baking soda in the cabin and trunk to keep things dry and prevent mold
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff