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Fading of brick, concrete block, stone, etc.
What people call fading is not an actual change of the materials inherent color. The "fading" appearance is actually some degree of efflorescence in the surface pores. Look very closely with a magnifying glass and you should be able to see that the white powder of efflorescence is what lightens the overall appearance. This is true of concrete block and pavers, clay brick, stucco, all stones, etc.
This includes concrete products. The pigments generally used worldwide to color concrete are "iron oxide minerals" and do not lighten in color from exposure to sunlight. However, this is not true if "organic" pigments (i.e. carbon black) were used as they will become lighter in color over time.
What this means is two things.
Another possible cause of patches of whitish staining that might be thought to be fading could be surface mineral deposits left behind by sprinkler water, rain water runoff, etc. You cannot always tell which is the true cause, but fortuntely both efflorescence and surface mineral deposits require the same steps and treatments. See surface mineral deposits in "Problem Solving"
Any Aldon cleaner has more than one purpose. It is not limited to only this cleaning project.