There are many reasons for whites to become dull. A very
common factor is hard water. The trace elements in the water can prevent soap
from lathering properly and the residue can leave a dull or gray appearance.
For slightly hard water, it is possible to overcome by simply adding more
detergent.
You can try an all fabric bleach (Bleach for
un-bleachable), or an oxygen bleach, but always test for color fastness on the
clothing, and add the bleach to the soap and water, BEFORE adding the clothing.
Even these ‘safe’ bleaches can cause damage if poured in concentrate, directly
onto wet clothing.
You might also try soaking in a solution of water and lemon
juice overnight before washing. Then add this soak water into the wash water
with the regular detergent when washing.
The final tip would be to hang these articles to dry in the
sun. The sun is an excellent natural bleaching tool, which can actually even
lighten some stains to the point they are invisible.
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