All our NIVEA Sun products contain different UV filters which protect the skin against UVA and UVB radiation. The UVA filters, in particular, can result in yellow staining. This stain formation is more likely to occur if the clothes come into contact with skin before the product is completely absorbed. In such cases, the clothes should be prewashed without any detergent at 30°C followed by a normal wash cycle with liquid detergent at 30°C. If stains are stubborn and still visible after washing, we recommend letting the fabric soak in a citric acid solution (50g citric acid in 1L water) for 1h then rinse thoroughly. Be careful with delicate fabrics, e.g. mother-of-pearl buttons. Please test any cleaning product on the product prior to the actual use on an unobtrusive spot. Alternatively, treat stains with a commercial laundry rust stain remover for fabrics, according to the product directions. Then, wash with liquid detergent at 30°C. Generally speaking, avoid bleaches, oxi-action products, powder detergents and washing at high temperatures. Warning: Be aware that citric acid is slightly hazardous in the case of skin contact (irritant, sensitizer), of eye contact (irritant), of ingestion and of inhalation (irritant). Skin contact can produce inflammation and blistering. Tissue damage is dependent on length of contact. For this reason, we highly recommend wearing protective gloves when handling citric acid and to not breathe in citric acid dust.