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• Humidifier, portable

  It helps if you hang onto the instructions. Here’s what to do if you can’t find them.

• Ketchup spills

  Fast action will help reduce chances this spot will become permanent.

• Marble

  Solid as a rock? Not quite, if it’s unsealed marble.

• Blinds, window

  How to be proud of their appearance again, the easy way.

• Ladder safety

  How to do it right when you have to work high off the ground.

• Nylons

  Protect stockings from laundry snags. Here’s how.

• Mineral scale

  That white or beige crust is coming from your tap water.

• pH

  Following is a quick lesson in the chemistry of cleaning.

• MERV

  A standard for rating heating and air-conditioning filter efficiency.

• Time

  How much time should be devoted to housekeeping? It depends....

• Smoke alarm

  Since the introduction of smoke detectors 40 years ago, deaths from residential fires have been cut in half. Here’s how to ensure maximum protection from your alarms.

• Silk

  Your best bet? Read and follow the fabric-care label stitched into the garment.

• Toxoplasmosis

  A concern for pregnant women and anyone with a weakened immune system.

• Litter box

  Scoop daily for your cat’s health — and for the sake of your nose.

• Bronze

  An ancient alloy that might not need cleaning, after all.

• Builders

  These additives build on the power of detergent in a number of ways.

• Grease

  Scrubbing won’t get rid of it. Here’s the easy way.

• Mud

  Spatters, spatters everywhere? Whatever you do, don’t spread them around.

• Fire alarm

  Professionally monitored systems are most often found in commercial settings.

• Oven, conventional

  Clear winner of the Worst Job in the House Award.

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