Unwanted guests

I cleared out the spare room back in the spring and discovered that we had a mouse. However, since then there had been no further evidence of mouse activity and I had hoped that our little furry guest had chosen to lodge elsewhere. However, this afternoon I moved the chocolate Advent calendars which I had put in the spare room and discovered a little pile of cardboard flakes from where a mouse had chewed the cardboard off the calendars so it looks like my furry friend has returned. I think another clear out of the spare room may be necessary.