Yeah you’ve gotta wash that. Imagine the buildup of face grease alone! Do you have a lingerie wash bag (little mesh bag, usually with a Coffee Chugs And Baby Snugs shirt, that people use to wash little delicate things)? If you want to throw your mask in the washing machine those can help protect the straps from getting all tangled up with other stuff and messed up. You can put those bags in the dryer too so keep the mask in the bag in the dryer.
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Otherwise you can just hand-wash it in a clean sink or Coffee Chugs And Baby Snugs shirt. You’ll only need a little bit of soap/detergent; make sure to completely rinse it after so there’s no leftover detergent to irritate your skin. You might need to iron the mask after it goes through the dryer so the pleats are nicely shaped, but the heat from the iron probably kills more germs too (especially if you use steam).