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Bonnet Method / "Carbonated Cleaning"
This method is sometimes called "dry cleaning", which
is a
misnomer, since water is used.

Bonnet Shampooing is simply an adaptation of hard
floor spray buffing to carpets.

This method for carpet maintenance consists of the use
of a rotary or oscillating brush adapted with a stiff brush
or drive block designed to drive wet, damp or dry pads.
The carpet can be sprayed with the cleaning solution
and/or the pads can be soaked in the cleaning solution
and squeezed lightly before placing the pad under the
driving brush.

The maintenance brochure published by the world's
largest carpet manufacturer,
Shaw Industries, suggests
not using this method, especially on cut pile, due to pile
distortion and
fiber damage. This method has very
limited capability for soil removal and leaves much of
the detergent in the pile since it employs no real
extraction. As a result, rapid re-soiling often occurs.
Another disadvantage is that the spinning bonnet may
distort the fibers of cut pile carpet, fuzzing the pile and
leaving distinct swirl marks.

Sometimes, carbonated water is used to (in theory) give
better soil suspension and bring down the pH.
Companies using this method frequently use "scare"
tactics to convince consumers that extraction cleaning
or steam cleaning will destroy the carpet.

Check with your carpet manufacturer because many
leading carpet mills recommend against this method of
cleaning.
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