What happens when you put brake fluid in the power steering spot?

Most likely the brake fluid will corrode and eat-away the seals on your Power Steering system.

Brake fluid has a mineral in it that the rubber seals of the PS system can't handle.

If you drive it long enough you'll either get severe leaks, or potentially the pump will seize.

Best advice is to drain the system, fill with proper PS fluid, run it, then drain again.

Get clear fluid if you can so you can tell when the brake fluid is out.

This will likely take a few bottles