I have created some list of properties under the TestCase. For example look at the following screenshot.
you can also use the following:
data = context.testCase.getTestStepByName("Test Case Name");
String[] propToRemove = new String[data.getPropertyCount()];
propToRemove = data.getPropertyNames();
for ( int i = 0 ; i < propToRemove.size(); i++ ){
data.removeProperty( propToRemove[i] );
}
Hope this helps. Now you can remove more than one prop.