The kitchen in the rental house I live in has a counter which was installed rather poorly - there is a gap of about an inch between it and the wall, and mice are able to scurry up this to the kitchen counter. I would like to seal this gap.
We've put out many traps, and tried our best to remove any potential sources of food, but it's an old house and we seem to constantly have mice problems in the winter, so sealing this gap would provide some peace of mind as it's the only access route to the kitchen counter.
One idea would be to use plastic tubing like this, only the gap varies between 1/4" and 3/4" in width, so we'd need to add a layer of sealant or something on top. The gap is too large to use caulk alone.