Engine: Degreasing/Cleaning

After buying the engine for quite cheap, it had been obvious that it hadn't been in use for a long time. The engine had grease pits, literally centimeters long. I wanted to clean it before swapping the engine. For reference, my mentor had told me that Gunk was the best for the bigger stuff. And for the smaller, harder to reach spots, I should use gasoline on a towel. The following pictures were before the engine was treated.