Once the car is off the drive, does it dry without staining your lock-block?
No error lights in the car to rule out low brake fluid. Dip your finger in, definitely not petrol? It could be water, it’s amazing after a night of rain where water can collect in the bulkhead scuttle or from engine tray, etc. Looks to be too much just for condensation in the exhaust system.
If in doubt, get a light under the car once it’s jacked up. Anything leaking will tend to travel and leave a mark on the underbody.