How to remove all eventhandler

Lets say we have a delegate

public delegate void MyEventHandler(string x);

and an event handler

public event MyEventHandler Something;

we add multiple events..

for(int x = 0; x <10; x++)  
{
   this.Something += HandleSomething;
}

My question is .. how would one remove all methods from the eventhandler presuming one doesn't know its been added 10 (or more or less) times?