Explain the problem as you see it
There is no search way to remove fields' content.
Why is this a problem for you?
I sometimes need to remove stuff from fields used in "Build types of fields". Removing it via the command line would be helpful and would spare digging through the collapsed node and its fields, especially hidden ones. A command via CMD+K would allow for assigning a shortcut for it also.
Suggest a solution
Command to set the field's value to empty.