After wearing, hang the garment to ventilate overnight before storing. Make sure your kimono is protected from sunlight and humidity during ventilation. Silk naturally repels dirt and microbes, so ventilating your garment is sufficient to keep your kimono clean under normal usage.
Once the garment is ventilated, fold it along the seams and existing folds to prevent new creases from forming. Kimonos will maintain their silhouette best when folded as opposed to hung during storage. Again, make sure to store your kimono in a place with no sunlight and low humidity.
In case of spills and stains, gently dab the spot with a cotton cloth dampened with a little silk stain remover. Do not use water as it can cause further damage. Occasional dry cleaning is acceptable if your garment is relatively new (circa 1960 or later). However, older vintage kimonos should not be dry cleaned owing to their fragility.
Unwanted creases can be ironed out using a conventional steam iron. However, ironing should be kept to a minimum as silk can easily be damaged by the heat. Be extra careful not to let condensation from the iron fall on the fabric as this can cause staining. Under no circumstances should embroidered parts be ironed. Ironing can also be used to get rid of smells that may develop on the garment over time, especially after extended storage.
Avoid wearing the garment when it is raining as vintage kimonos easily sustain water damage.