We did the pepper mint oil on cotton wool thing. It didn't work one bit. Then when we moved house we found all the balls of cotton wool had been dragged underneath the sofa and shredded to make a lovely little nest for the fuckers.
I don't think any of the methods are foolproof but at least this one is humane, and minty fresh. It may work for the OP
@Raymo started
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We did the pepper mint oil on cotton wool thing.
It didn't work one bit.
Then when we moved house we found all the balls of cotton wool had been dragged underneath the sofa and shredded to make a lovely little nest for the fuckers.