Dirt: Layers of dirty film on windows and screens provide a helpful filter against harmful and aging  rays from the  sun. Call it an SPF factor of 15 and leave it alone.

Cobwebs: Artfully draped over lampshades reduce the glare from the bulb, thereby creating a romantic atmosphere. If someone points out that the light fixtures need dusting, simply look confused and exclaim "What? And spoil the mood?" (Or just throw glitter on them & call them holiday decorations.)

Pet Hair: Explain the mound of pet hair brushed up against the doorways by claiming you are collecting it there to use for stuffing hand-sewn play animals for underprivileged children. (Also keeps out cold drafts in winter.)

Guests: If unexpected company is coming, pile everything unsightly into one room and close the door. As you show your guests through your tidy home, rattle the
door knob vigorously, fake a growl and say, "I'd love  you to see our  den, but Fluffy hates to be disturbed  and the shots are SO expensive."

Dusting: If dusting is REALLY out of control, simply place a showy urn on the coffee table and insist that "This is where Grandma wanted us to scatter her ashes."

General Cleaning: Mix one-quarter cup pine-scented household cleaner with four cups of water in a spray bottle. Mist the air lightly. Leave dampened rags in conspicuous locations. Develop an exhausted look, throw yourself on the couch and sigh, "I clean and I clean and I still don't get anywhere." As a last resort, light thokies for a bake sale for a favorite charity and haven't had  time to clean...Works every time.

Another favorite, I think from Erma Bombeck, always keep several get well cards on the mantle so if unexpected guests arrive, you can say you've been sick and unable to clean