If the stain is no longer fresh, an additional cleaning product needs to be used. For a standard synthetic fibre carpet, we recommend using a solution with an alkaline pH level, slightly below or above 10, to remove the stain.
In public and heavily used areas such as restaurants, where dirt may be more deeply embedded, a more alkaline product should be used, with a pH level of around 12.
Note: it is important to check how the cleaning product reacts on the specific carpet. We recommend testing it beforehand on a less visible spot.
If the carpet is generally faded or hand cleaning no longer gives the desired result, it is worth considering professional deep cleaning of the carpet.