What could be leaking

Gen IV beginning in your model year are experiencing a heat exchanger failure located within the final catalytic converter stage approximately under the front passenger area, mid-vehicle. In most of the descriptions I've read, here or just search on heat exchanger or low coolant, the coolant leaks into the exhaust stream and is vaporized out the tailpipe. You might just have a leak in the flexible hoses down there and not a heat exchanger failure. Usually when the SLLC fluid dries it leaves a pinkish crusty residue, which doesn't look like what is on your garage floor. Might want to get the vehicle up on a lift and have a look.

 

Thinking some more about this, I assumed that Toyota Super Long Life Coolant (SLLC) was in use. Other types of coolant would leave a different residue. And in my experience, other types of coolant don't necessarily evaporate that quickly or soak into the concrete. Brake fluid doesn't evaporate or leave a residue, and will percolate into concrete rather quickly. Need to take a look underneath to sort this out.

 

DON’T PANIC. Air conditioner condensation. I have seen the same pattern with my 2022 with a whopping 2900 miles on it. If in doubt, have your dealership check it out.

 

Our road crews here don't put down salt but magnesium chloride and that looks very similar...it melts and dries to a whitish color. If you've checked coolant and oil levels and they are good, I wouldn't worry about it.
FWIW, this is the reason I wash my cars every chance I get in the winter, including behind the wheels....get that crap off my car!