You can reset colour effects created with the Colour Warper.
To reset a colour correction:
You can clear or reset several Colour Warper values in the Basics menu using individual Clear/Reset boxes. C resets the value for the current frame by setting a keyframe. R resets the value for the entire animation curve.
To reset a Colour Warper value:
In the Basics menu, do one of the following:

The value is reset at the current frame.
The value is reset for the entire animation curve.