You should wash your curtains to remove any stains. But before you do so, you can take some steps to weaken the stain for easier removal during washing. Here are some common types of stains and how you can prepare them for laundry: 1. Yellow stains:  Mix one part baking soda with one part bleach and laundry soap and apply it to the stains. 2. Sticky stains from tapes or gum: Rub ice cubes on the stain for about 20 minutes then scrape off the hardened remains after. 3. Oil. Before washing it with warm water and laundry detergent, blot the fabric with a warm sponge soaked in dishwashing liquid. 4. Alcoholic beverages. Clean with a mixture of white vinegar and water. 5. Smoking stains. Mix borax, hot water, salt, and baking soda then soak your curtain in the mixture. If the stain persists, rub an alcohol-soaked cotton ball to remove the stain. 6. Blood. Soak in cold water to remove the stain and wash it as usual. 7. Urine: Use dishwashing liquid, essential oils, and vinegar to clean up the stain.