Even though vacuuming can remove most soil,
it is also necessary to clean your carpet on a regular
basis to remove the oily, sticky soil that vacuums don't
remove. These soils result from cooking vapors, air
pollution, and tracked-in dirt from outside. The particles
of oily soil deposited on carpet fibers can cause gradual
but significant dulling of colors. The color isn't lost,
but is hidden under the film. If this type of soil is
allowed to accumulate, it begins to attract and hold the
dry soil.
If carpet is cleaned before it becomes too unsightly, the
cleaning chore will be easier and more successful. Carpet
in a typical household should be cleaned every 12 to 18
months, depending on the number of residents and amount of
activity.
Choosing the proper cleaning system is important. Some
systems may leave residues which accelerates re-soiling
and defeats the whole purpose of cleaning.