The passage of time, the effects of sunlight, the step of the shoes, and other spots that may fall on the original stain can complicate the cleaning. Although each situation requires a differential treatment.
We advise you to according to the use which have their rugs, perform a deep cleaning each year, for cleaning of bacteria and other organisms that so unnoticed accumulate in their tissues and in this way you will get in your home a cleaner environment and healthy.