Definitions for "Soiling"
Keywords:  dirt, detruis, soot, dust, fingerprints
Solar modules accumulates dust, dirt, leaves, bird dropping and other detruis over time. These materials block some of the sunlight from striking the PV cells (or thermal absorber in the case of a solar thermal system). For roof mounted systems, this blocking of the sun can amount to 5-10% over a years' time, and it is important to wash solar panels about once a year to keep soiling to a minimum.
Light, moderate or heavy deposits of dust, dirt, soot, generally deposited by electrostatic action.
Deposition of dirt or other materials upon the face of a painting; this may include fingerprints.
Passage of stool into the underwear rather than a toilet.
Soiling in children is the involuntary passage of stools in conjunction with constipation (abnormal if > 4 years of age, Boys : Girls = 3 : 1)
Organic and inorganic substances and residues on the surface of the paper. Different than stains, smudges, and mildew.
Keywords:  poo, don't, mean, you
Having a poo when you don't mean to
Keywords:  something, act
the act of soiling something