What's the gray residue in my water? We moved into this home (built circa 1985) 2 years ago. After bathwater has drained, you find a silty residue left in the tub. You can't see it in the water itself. Residue looks a bit like the calcium deposits one might find normally, but ranges from gray to sometimes sandy brown. Lately there is also some substance much like this clinging to dishes after the dishwasher runs too. [more inside]
posted by keener_sounds on Sep 19, 2009 - 5 answers

Best way to get duct tape residue off windows, and how to hold broken car windows up? [more inside]
posted by nmaster64 on Sep 16, 2009 - 14 answers

What's the best way to remove thoroughly sticky residue from furniture that appears to be vinyl? [more inside]
posted by kidbritish on May 25, 2009 - 11 answers

What are these brownish-blackish floaty smudgy bits that drift down out of my ceiling vent at work? Is the stuff dangerous? [more inside]
posted by Askr on May 21, 2009 - 5 answers

A mysterious gray film/residue is appearing on all of the plastic in my apartment. What is going on? [more inside]
posted by prefpara on Feb 17, 2009 - 21 answers

How much pesticide residue is there in coffee? Is it necessary to buy organic? [more inside]
posted by mintchip on Feb 9, 2009 - 14 answers

My old water well was "dug" with dynamite. I drank the water for years. Did the dynamite residue harm my health? A voice on the radio implied it might have. Google is un-helpful so far. I'd appreciate facts rather than speculation.
posted by Hobgoblin on Jan 1, 2009 - 15 answers

Whenever I drink tea, I'm always left with a sticky sugar/honey residue in the bottom of the cup. Is there any way to avoid this?
posted by Mr. President Dr. Steve Elvis America on Oct 24, 2008 - 13 answers

Green "rocks" in my plumbing fixtures: what are they? [more inside]
posted by chazlarson on Jan 31, 2006 - 15 answers

How do you get that sticky glue residue off of the the back/front of things (e.g. a book) that a sticker used to be on? [more inside]
posted by Stauf on Nov 2, 2005 - 25 answers

What's this blue residue in my sink and tub? [more inside]
posted by Big Fat Tycoon on Sep 19, 2005 - 14 answers