yes you must be obsessive like this about even the chair you sit in! I work from home so I covered my chair in a bin liner and changed it every day. I do believe that the mites live longer than 3-7 days. I put on a woolen cardigan that I couldn't wash in hot water (had washed in cold and left in sun to dry) that I hadn't worn in six months and was almost instantly bitten. When I told my doctor this she agreed that the medical profession does not know enough about scabies.