Can Fengyoujing be washed off?
Generally speaking, whether medicated oil can be washed off depends on the specific situation. If discomfort occurs, it is recommended to seek medical attention promptly. The detailed analysis is as follows:

If medicated oil has come into contact with hydrophilic fabrics such as cotton or linen, or surfaces like skin or tiles, and has not remained for long, it can usually be removed. Fabrics can first be pre-treated with dish soap or laundry detergent, gently rubbed, and then washed normally. Skin can be gently wiped with warm water and soap, while hard surfaces such as tiles can be cleaned directly using a damp cloth dipped in cleaning agent. Residue can thus be removed by taking advantage of the solubility of oils.
If medicated oil has stained delicate materials such as wool or silk, or surfaces such as leather or painted finishes, and has not been treated for an extended period, it may be difficult to remove completely. These materials have low tolerance; ingredients in medicated oil may penetrate fibers or corrode surfaces. Aggressive cleaning could cause fabric deformation or discoloration of leather, further damaging the original condition of the material, so caution is required.
To avoid skin irritation or damage to items, immediate cleaning after contamination is recommended. If allergic reactions such as redness, swelling, or itching occur on the skin, or if noticeable residue remains after cleaning, prompt medical attention or professional cleaning services should be sought.