Mice do not need a dramatic opening or a direct route across the middle of a room. They can follow cabinet backs, plumbing holes, wall-floor junctions, utility chases, garage transitions, and basement framing while remaining mostly out of sight.
That is why a mice exterminator in Cleveland should look at both the occupied room and the concealed path around it. Treating only the countertop or placing devices wherever droppings happen to be visible may miss the route that connects food, water, nesting cover, and entry.
Mouse control also requires proportion. One old dropping inside a vacant cabinet is not the same as fresh evidence appearing nightly in several rooms. Useful service begins with location, recurrence, and context.