The power steering gear box is leaking.
Although I have seen the gearboxes leak in the field, the more common place they tend to leak is the power steering lines themselves, and occasionally from the pumps. I would start by cleaning off all the surfaced of the mentioned components, and start the vehicle to see where it gets wet first. You may need help from a trained technician, if so YourMechanic offers mobile car technicians that can come to your location to detect and repair your power steering fluid leak.
Have a car question? Get free advice from our top-rated mechanics.