The Noha Originals are crafted from untreated hardwood and only consist of natural materials. The cars are very durable and will stand the test of time, if they are treated with care.
Keep in mind, untreated solid wood is sensitive to liquids which can easily be absorbed. To remove stains only use a mild detergent on a soft cloth dissolved in warm water. Gently rub until the spot has gone. Let it dry. Repeat the process if needed.
Do not expose the cars to strong sun-light, wash or dry at a high temperature. Never clean in a dish-washer, washing-machine or a dryer. Preferably use indoors.