Turn inside out. Wash in cold water. No bleach. Tumble dry low, no fabric softener. No dry cleaning.
My dryer has an extra low setting, and I use that. But most dryers only have low. Just remember to turn inside out and avoid high heat.
Edited to add, you could hand wash as Lucia said, and lay flat to dry, but I get way too much wrinkling when I do that. And then I have to iron…and you can’t iron over the art…
Just be gentle, use cold water, gentle wash and spin, etc., and avoid high heat.
Nothing lasts forever tho. :)