It is unfortunate that your parked car was hit but it appears you have found the likely culprit. You do not have to confront the driver by yourself. You should contact the police so they can come out to view the damage and write up a police report. You should also show them the car that you believe did the hit and run damage. The law enforcement officer should then be able to help you figure out what the next step should be.
If it will be a few hours or even days for the police to come take the report you might want to go out and take pictures of the damage to both your car and the car that you suspect did the damage. This could help you if the person tries to clean the car.
The Value of Taking Accident Photographs is an article that could help you know how to take the best pictures of the vehicles.