To remove watercolor stains follow these tips: If the watercolor has not completely dried on your garment, you can remove the stain using detergent, liquid soap or bar soap. The latter will not be as effective as detergent, but they will still work. First, moisten the back of the stain on the garment with warm water. Then, apply the detergent or soap on the stain and rub gently with your fingers or a toothbrush. Let it act for a few minutes and then rinse with cold water. Repeat the process if necessary and then wash the garment as usual. If the watercolor has already dried on your garment, you can soften it with a mixture of warm water and glycerin in equal parts. Apply this solution on the stain and let it act for 15 minutes. Then, rub with a clean cloth or a toothbrush to remove the pigment. Rinse with cold water and then wash the garment as usual. If the stain persists, you can try with a mixture of hydrogen peroxide and a few drops of ammonia. Apply this solution on the stain with a cotton or a sponge and let it act for a few minutes. Then, rinse with cold water and wash the garment as usual. Be careful not to use this solution on wool or silk garments, as it could damage them. If the watercolor has fallen on a surface of wood, marble or ceramic, you can rub the stain with a cloth moistened in hot water with a little ammonia. If there is still some trace, you can rub with alcohol. Be careful not to use these products on painted or varnished surfaces, as they could damage them. If a garment has faded or stained in a small area due to bleach or other bleach, you can make the tone with watercolor paint and with a small brush and very carefully, paint the faded space without touching the edges, let it dry and apply another layer until you reach the desired color. Let it dry for several days before washing. I recommend doing a small test in a non-visible place before covering the stain.