My son just threw up in his Recaro Young Sport and nowhere in the manual can I find anything about how to clean the straps and buckle! This is the second time he has thrown up in this seat and only about the sixth time riding in it! (He never threw up in his old seats, and only ever thrown up at all one other time that I remember.) The last time we just wiped the straps with damp soapy cloth, but that time it was more projectile. This time it's all in the buckle and already crusting. Can I rinse out the buckle and really clean those straps?