Dirt is more common in light skins.
It is important to know that you do not dry clean and certainly not in a regular washing machine, but manual dry cleaning. When you put it in the preparation, it shrinks the parochet
Stains are usually caused by human hand contact that contains human fat or dirt from the skin.
There are a few options: first a mop sometimes a mop just removes the dirt.
If the wipe doesn't help (for white cloth only) there is a cleaning foam mixed with a little bleach, a very gentle substance - spray a little on the spot of dirt and with the help of a wipe/mesh rub the spot and let the place dry completely, or a gentle degreaser suitable for fabrics, this is also suitable for dark cloth.
You can use vinegar and let it dry. If necessary, repeat the operation a second time.