Window weather stripping

Photo: David De Lossy/Photodisc/Thinkstock

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The Part of Your Window No One Notices
Since the weather-stripping on many windows is black, you may not even notice the grime that accumulates there. Wipe that area down with white vinegar twice a year to keep the tracks clean, Rapinchuk says.

If you look at the weather-stripping and think you see mold—which happened to Rapinchuk's friend, who thought to look for it only after seeing an allergist about her nonstop sneezing—you may want to call a professional.