Car seat insert for Graco Forever 4:1

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Hi all! Is there a washable cover for the seat of the Graco Forever 4:1 car seat? I didn’t see anything online so that makes me thing Graco didn’t approve of one. Or am I wrong?

Going to be potty training in august once our little one goes to a new class in daycare. I’m just worried about a few road trips. I know car seats are a pain to wash. Any recommendations that are Safe? I don’t want to go against what is truly recommended. Thanks!