The truth is that the double stroke carpet cleaning technique causes blotching as a result of over wetting. Solution soaks deeper into the carpet at the end of the back stroke as the direction of the cleaning head is reversed. The excess moisture is not picked up immediately by the vacuum head and is allowed to settle to the base of the carpet fibers causing uneven wetting.

When moisture wicks to the surface seeking air to dry, it evaporates and leaves a trace of any mineral or chemical content. The wet spots dry slower and leave more trace deposits than lightly moistened areas. Discoloration may not occur for weeks or even months after the carpet is cleaned and most times it is blamed on the carpet.

The single stroke carpet cleaning technique taught at Bane-Clene Institute ensures that the carpet cleaning solution is applied only on the back stroke. It is essential to learn the cutoff point at the end of the solution application stroke and pass the vacuum head beyond that point. Even wetting and thorough extraction cleaning leaves a carpet looking like new.