Many people have had a service done only to find out that there is now what looks like oil, but is really melted grease on the front fender, sometimes on the tank and sometimes on the left front lower fork slider. (because of the position when parked)

The culprit here is usually a fresh greasing on the steering head that melts when the bike is ridden and heated up or parked in the sun and causes a panic about something leaking.

Simple solution is to take a Q Tip and remove the excess grease that has oozed out through the bearing , you may need to do this more than once after another ride , but it will stop the dripping mess on the front end.