An Acceptable and less hazardous method of cleaning than the use of chemical solvents is D. Mechanical cleaning.
Mechanical cleaning involves the use of sandpaper, abrasives, or other cleaning devices. This implies that large quantities of chemical solvents are not used.
Disposable wipes contain chemical solvents. Sometimes, the wipes are littered or improperly disposed of, thereby contaminating the environment.
Dishwashers use chemical solvents. Otherwise, they are just electro-mechanical devices for washing food dishes and other utensils.
A water hose used for cleaning must combine some chemical solvents to achieve cleaning effects.
Thus, the only solvent-free and less hazardous method of cleaning is Mechanical Cleaning.
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