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2. Stain removal - Wikipedia

   en.wikipedia.org/wiki/Stain_removal

   Alkaline stain removers are mostly used in the removal of oil-based stains via the process of saponification. [6] Sodium hydroxide is also commonly used in drain cleaners. It allows grease and other oils to dissolve into aqueous solutions like water. Other alkalis such as potassium hydroxide (much stronger than sodium hydroxide) are also used ...

3. Photocatalytic concrete - Wikipedia

   en.wikipedia.org/wiki/Photocatalytic_concrete

   In order to avoid frequent cleanings of new church's concrete "sails", new development was used - white self-cleaning coating of the walls. [3] However, back then it wasn't known that this colouring plaster containing titanium dioxide and white pigment absorbs exhaust gases and other elements of city fog.

4. Snowmelt system - Wikipedia

   en.wikipedia.org/wiki/Snowmelt_system

   A heated sidewalk in Holland, Michigan Installation of a geothermal snowmelt system on a street in Reykjavík, Iceland.. A snowmelt system prevents the build-up of snow and ice on cycleways, walkways, patios and roadways, or more economically, only a portion of the area such as a pair of 2-foot (0.61 m)-wide tire tracks on a driveway or a 3-foot (0.91 m) center portion of a sidewalk, etc.

5. Road surface - Wikipedia

   en.wikipedia.org/wiki/Road_surface

   Concrete roadway in San Jose, California A concrete road in Ewing, New Jersey. Concrete surfaces (specifically, Portland cement concrete) are created using a concrete mix of Portland cement, coarse aggregate, sand, and water. In virtually all modern mixes there will also be various admixtures added to increase workability, reduce the required ...

6. Rust converter - Wikipedia

   en.wikipedia.org/wiki/Rust_converter

   Rust converter is usually applied to objects that are difficult to sand blast, such as vehicles, trailers, fences, iron railings, sheet metal, and the outside of storage tanks.