Carpet tiles can be washed with carpet cleaner; always follow the manufacturer's instructions. Some tiles can be cleaned with bleach solution to remove stubborn marks. Just check a small area first, or telephone us for advice. You may even take the tiles outside, pressure wash them, and leave them to dry in the sunshine.
With most stains, dab up the excess with a cloth, and clean the stain working from the outside into the middle so that you do not spread it.