In other words, make sure you dust before viewers come round and get rid of the little toenail collection from wherever it may be accumulating. Dust the cobwebs from your ceilings, blitz the dust on your shelves and give your TV a wipe. Getting your carpets cleaned is not a bad idea. It's amazing how much life it can breathe into a room. Clean the windows.
Grimy windows make the place look a bit tatty and neglected.
They also stop any magnificent views the property may enjoy from having the desired effect. Clean or repaint the skirting boards, especially if you decorate anywhere else. Dry-clean or steam clean your curtains. Make sure that your rubbish bins are clean and don't' smell badly. The main benefit of having a good tidy up is that storage space generally looks bigger and more useful if it is only half full, rather than brimming with useless items that get in the way of seeing just how much space there is.