Nope, it's not urates. I just soaked her for 30 min, and scrubbed all the areas with a tooth brush. They are still there! I believe it's a fungus. I put some lotramin on it, so we will see..... This tortoise came from south Florida, and had shell rot on her plastron when I got her. I've had her about 6 or 7 months now. Her plastron looks better, but it's still not totally gone. I'm in GA, which isn't much better for the moisture, but it is a little better. I keep her hide box dry, but of course our ground has been pretty wet.