I preferred answering when the facts were kept simple.
Yes, at some point it becomes reasonable to just terminate the relationship, and not even let the workmen back on the property, and further adjust any payment for the expense to be incurred for the unfinished clean up. But when that point of saying "enough" reasonably arises is a question of fact under the totality of the circumstances under which the job unfolded, invariably with "he said" vs. "he said" factual disputes, asking whether you have corroborating witnesses, and conceding that any judge assigned to the dispute might not have the patience and skills to reliably sift through any competing versions of the facts . . . I'd clearly communicate you have till X day to "clean up and go", and then say "just go."
And yes, negligence in performing a contractual arrangement can lead to liability for trees falling on cars and roofs and people. And failing to be properly bonded in that jurisdiction would be reasonable grounds for not letting them back on the property for further work.
GL
