Yes, he will absolutely still try to mate. He should get neutered asap. As far as their smell, especially because they are somewhere new, they're probably both marking overtime. Neutering will also help out tremendously with odor. A good diet will help too. If they smell, washing them will not help. They'll keep marking more to get their scent back. If they ever need help being cleaned, which they should very rarely, use a warm washcloth and make sure they get completely dry.