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Take your blinds down Remove the fabric insert from fabric blinds. Wash your blinds thoroughly. Let the blinds dry.
. When you paint your blinds, they need to be on a flat surface so you don't drip paint everywhere, which means you need to take them down. Alternatively, you may want to hang them up outside to paint to reduce the mess. Either way, you need to take them down from their indoor location. Usually, individual slats will unhook from the top. Some vertical blinds have a fabric insert, while others are just fabric on one side and vinyl on the other. If yours have the insert, pull it out before you start painting. You may need to slip a credit card between the slat and the fabric to get it going. If your blinds have been hanging up for any length of time, they likely have dirt and grime on them. Wash them with soapy, warm water. Dish soap works well for this purpose.  It can be easier to take them outside to scrub. Some blinds are machine washable. Check the tag to make sure yours are. Coil them together in a pillowcase, and put them in the washing machine with a few towels. Use the gentle cycle, warm water, and detergent. Before painting, your blinds will need plenty of time to dry. If they're fabric, you may want to let them dry overnight. Lay them out flat, and turn them over after a few hours so both sides can dry. For vinyl blinds, you can wipe them down to speed up the process. The blinds should be completely dry before you start painting.