'Remove all selectables from the reactor, kill any of them that were
processes, and return their string representation.'

def _cleanReactor(self):

    reactor = self._getReactor()
    selectableStrings = []
    for sel in reactor.removeAll():
        if interfaces.IProcessTransport.providedBy(sel):
            sel.signalProcess('KILL')
        selectableStrings.append(repr(sel))
    return selectableStrings
