Once he was ready to go inside, the air conditioned house was too much for him, and he melted down crying from the cold. He is really not a fan of being cold. We have these same meltdowns every time he gets out of the pool/river/lake on a day that isn't 90 degrees or more.
I tried putting him in the shower to rinse all the mud off, but he wasn't having that either. So we resorted to the kitchen sink, which is where he used to bathe a long, long time ago. He ended up using the dish soap by the sink to make bubbles, and probably spent thirty or forty minutes in the sink, with bubbles and warm water, completely entertained. He refused to get out until he had emptied the small bottle of dish soap completely.