Heat, humidity, and insects are natural enemies of fabric. This triple threat, all too common in garages, puts clothing and bedding at risk of mold, mildew and other damage. Whether it’s a box of baby clothing, last summer’s apparel, or your wedding dress, if you want to protect it, don’t put it in the garage. This also goes for a spare mattress. Even if it’s tightly wrapped, tiny insects and car fumes can infiltrate.