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  2. Descaling agent - Wikipedia

    en.wikipedia.org/wiki/Descaling_agent

    Limescale build-up inside a pipe reduces both liquid flow and thermal conduction from the pipe, so will reduce thermal efficiency when used as a heat exchanger.. A descaling agent or chemical descaler is a liquid chemical substance used to remove limescale from metal surfaces in contact with hot water, such as in boilers, water heaters, and kettles.

  3. Stain removal - Wikipedia

    en.wikipedia.org/wiki/Stain_removal

    Another factor in stain removal is the fact that stains can sometimes comprise two separate staining agents, which require separate forms of removal. A machine oil stain could also contain traces of metal, for example. [1] Also of concern is the color of the material that is stained.

  4. Calcium Lime Rust - Wikipedia

    en.wikipedia.org/wiki/Calcium_Lime_Rust

    May 2012) (Learn how and when to remove this message) Calcium Lime Rust , more commonly known as CLR , is a household cleaning product used for dissolving stains, such as calcium , lime , and iron oxide deposits.

  5. How to Remove Almost Every Type of Stain - AOL

    www.aol.com/lifestyle/remove-almost-every-type...

    OxiClean uses the power of oxygen to remove even the toughest stains and is a favorite of the pros. With more than 18,000 five-star reviews on Amazon, it’s also a favorite of everyday users.

  6. So, You Have a Water Stain on Your Ceiling—Here's What a ...

    www.aol.com/lifestyle/water-stain-ceiling-heres...

    A water ring on your ceiling is a sign of a leak. We asked expert plumbers how to identify the source of the leak and solve the problem.

  7. Conservation and restoration of frescos - Wikipedia

    en.wikipedia.org/wiki/Conservation_and...

    The presence of pigment discoloration, stains and the formation of bio-film are indicative of chemical degradation. Given the variety of organic and inorganic molecules present in frescoes, many type of micro-organisms may grow on the substrate of the fresco provided that environmental conditions (humidity, temperature, light, and pH) are ...