Mr clean sponge
To clean graphite grease from curtains, gently rub with a soft eraser to remove excess graphite. Spray on a dry-cleaning solution and apply a dry spotter. Moisten a dry pad with the dry spotter and rub into the dry spotter on the stain. Apply dry spotter to a clean pad and lay on the stain for at least 30-minutes. Spray with the dry-cleaning solvent again and allow to air dry.
The surface of the table was clean of bacteria.
Why should you keep the monitor's surface clean
Moss grows anywhere it can. If an indoor surface is clean moss won't grow on it, but outdoors there's no such thing as a clean surface, so moss will grow there if the climatic conditions are right.
bacon
Graphite (I think)
decomposers
Rubber as a compound can be formulated in many ways. In erasers it is made to be stickier to graphite particles from lead pencils than paper so the graphite preferentially sticks to the eraser. The rubber is also soft so the paper abrades it and the graphite containing surface os worn away for disposal. The result is clean paper and rubber/graphite dust. Some very soft erasers for art work are very soft so that no danmage to the paper happens, These can retain the graphite and eventually get quite dirty and have to be discarded as they leave maks rather than remove them. Some erasers contain a bit of abrasive and remove the top layer of the paper as well making them useful for removing inks that penetrate the paper surface. A rubber ball is generally made from a harder and tougher rubber without the stickiness or softness of the eraser. Most modern "rubber" balls are made of chemical polymers which are not really rubber and have to affinity for graphite.
Yes, because its more complex to clean up groundwater than surface water.
because carbon graphite had carbon but graphite does not have carbon
A sharp point on a pencil will be eroded by a rough surface (paper) and leave a coating of graphite. This does not immediately penetrate the paper and can be erased. After some time, the paper will absorb some graphite molecules into its structure, and erasures will not be complete.