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Allow the tortoise time to fill up its water reserves before you try to scrub it. Give it a 20-minute soak in clean water. Tortoises need soaking more often than they need baths. You shouldn't need to actually scrub your tortoise very often. Next, use an old, clean toothbrush to scrub the tortoise all over. Start with the shell, being sure to get in all the cracks. Move on to the legs, arms, and head. Be sure not to scrub too hard, especially on the places without scales. Use the water to wash off the dirt you've scrubbed clean. Gently pour it over the tortoise to get the grime off. While you're washing, make sure to look for any injuries, nicks, or an unhealthy shell. If you notice any abnormalities, it may be time to take your pet to the vet for a check up. Use a towel to pat the tortoise dry. You don't want him to be wet when he goes back to his enclosure. Soaps, detergents, and shell cleaners are not good for tortoises. In fact, they can be harmful, even killing your pet. Stick with plain water to clean your tortoise.
Let the tortoise soak first. Scrub the tortoise gently. Wash away the dirt. Dry the tortoise off. Don't use soap.