The internet says washing and drying on hot will kill them, but I'd always worry about some escaping just getting them to the machines. It also says leaving in a plastic bag in the hot sun will kill them; since you're where it's hot and sunny, I'd probably do that before I washed them.

So be sure to park your car in the sun for a while!

"A creature's thermal death point is the temperature at which it cannot
survive. Bedbugs die at 113 degrees Fahrenheit, but eggs can survive
slightly higher temperatures. The eggs also survive heat for longer than
bedbugs at other stages of development. According to Dr. Dini M. Miller
of the Department of Entomology at Virginia Tech, 113-degree
temperatures kill bedbugs within 90 minutes, but the bugs die at 118
degrees in only 20 minutes. At 118 degrees, bedbug eggs die within 90
minutes; at higher temperatures, the eggs die faster.

Basic Drying

The heat of a clothes dryer is high enough to kill bedbugs in all stages of
their life cycle. Some machines, however, take longer to heat up than
others. If your dryer reaches 120 degrees, it can kill bedbugs and their
eggs quickly -- but it might take the dryer 10 to 15 minutes to reach
that temperature. Because of this delay, tumble-dry your clothes on high
for 30 minutes to make sure the heat treatment is effective. You don't
need to wash your clothes before drying them to kill bedbugs and their
eggs."

Washing clothes and bedding is a simple and cheap method of killing all bed bugs. It is a very important part of both do-it-yourself bed bug control, and when you have professional pest control company apply insecticides. Washing will kill some of the bed bugs, but it is the heat of drying that will kill any remaining bed bugs. With a few common-sense practices, you can easily disinfest clothes and ensure these items do not become bed bug hiding places as you remove bed bugs from the rest of your home washing clothes to control bed bugs

There is a Laundry forum that I understand is quite active. Mamapinky frequents that forum, among others. They can likely give you some good information.

I agree with the above. But I have read that being tightly sealed in a plastic bag and in a hot place, can help as well. I'd just get them out of my car (you do NOT need escaping bed bugs in your car!), and put it in the driveway in the hot sun until you can take further action.

Wash with hot and dry in hot dryer minimum of 30 min. or freeze for 4 or 5 days.

Are you sure it has bedbugs? Just to be on the safe side, I would wash it at a laundromat in hot water and a very hot dryer and dispose of the bag it was in.

You do not have to wash an article to kill bad bugs, although you may wish to wash it anyway. Its the heat that kill bedbugs. 140 F for a an hour or two may be enough. If you want to do the job faster, raise the temperature. I haven't checked my data sources recently for the required time and temperature, therefore, it is advised you check to see what the minimum requirement is.

I have heard of one method that some exterminators use for treating a room is to raise its temperature to 140 F.

I think a sure way to rid bedding of mites and bugs is to tumble in dryer on high heat, then wash in hot water, then dry again. Bugs wash away easier when dead, than clinging.

Put the cover in a heavy plastic bag and throw an opened no pest strip in, tie it up and leave it for a few days in the garage. (of course if they are still around after 3 years, the length of this thread, sterner measures are called for.)

LOL, Lucille! Sterner measures after 3 years is right!

Also powder...,lots of powder/cornstarch and powdered floor cleaner its smothers them.

I've never heard that bedbugs are smothered by powder. However, if they don't like powder they may not like dust either, so one could use that as a reason to neglect the bothersome underbed vacuuming when cleaning your room.

Strongest form of rubbing alcohol and lemon juice mixed non diluted sprayed on them kills on contact.

You'd have to practically soak the corners of the mattress to get them as they scoot and hide. That's a lot of alcohol. I'm thinking as it evaporates into the room, if you inhale enough you aren't going to care whether there are budbigs or not...