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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

    Stain removal is the process of removing a mark or spot left by one substance on a specific surface like a fabric. A solvent or detergent is generally used to conduct stain removal and many of these are available over the counter.

  4. Conservation and restoration of frescos - Wikipedia

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

    The oldest method, known as the a massello technique, involves cutting the wall and removing a considerable part of it together with both layers of plaster and the fresco painting itself. The stacco technique, on the other hand, involves removing only the preparatory layer of plaster, called the arriccio together with the painted surface.

  5. 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.

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

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

    The post How to Remove Almost Every Type of Stain appeared first on Reader's Digest. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us ...

  7. Calcium Lime Rust - Wikipedia

    en.wikipedia.org/wiki/Calcium_Lime_Rust

    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. Ingredients [ edit ]