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I've washed our car seats quite a few times and don't see a problem why you can't, especially if it's filthy. If you're worried just hand wash and throw it in the washer to spin the water out and hang dry. I even washed the straps and hung those to dry as well. Both dried by the next day or probably sooner since it's all synthetic materials. I had a Peg Perego infant car seat and currently have multiple Diono Radian RXT car seats.

oh crap I never checked this and we washed our chaperone cover....It came out fine, if that makes you feel any better!

@HappyBaker: Im sure it's fine I did air dry mine though!