Do not take by mouth. Clocortolone topical is for use only on the skin. Wash your hands before and after using clocortolone topical, unless you are using the medicine to treat the skin on your hands. Apply a small amount to the affected area and rub it gently into the skin. Do not apply clocortolone topical over a large area of skin.
Your foundation should be at least 18 deep, and be 8 wider than your foundation wall. If you have an 8 foundation, you should have 4 on each side at the footing. So for a 8 foundation, the footing width would be 16.
Here is a very rough estimate. For a foundation having full depth walls of 8' and measuring 40' x 50', plus the garage foundation at 4' depth measuring 24'x30', I would probably estimate 3 full days of a track hoe to demo' the walls and (2) trucks to haul it away.