Q:

JMeter: How can the props be cleaned between executions?

In my test plan, I'm setting an object inside the props. But then, if I run the test plan twice in a row, the second time that I execute it, the object has the value of the first time. 
Is there any way to "clean" the props after the test has finished? 
I can only find how to clean it after each thread execution. 

A:

You can update properties in JSR223 Element using props
In your case props.remove("propName") will remove specific property.
Also you can override property with function 
 ${__setProperty("propName", "newValue")}

