He won't stop until he's neutered, and he might continue for a while afterwards. If you get a cleaner with enzymes and use it generously, you can remove some of the odor, but he will definitely continue until he's neutered. A tom knows when there is a female in heat, and at times, the discharge from a pregnant cat can fool him. Or, there could be a female in the area.
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden