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Help please :(

Hi there we had a broken window on a rental Property a family member came over replaced the glass along with a piece of wood for the frame (it was rotten) he left it covered it putty and I don't know what to do to make sure it's secure and clean, I thought he would come back to finish it but there's been a falling out between us and just found out today we have a house inspection next Tuesday urgently need some help