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You should be able to remove the paint stain by rubbing the area with liquid dishwashing detergent, let stand a few minutes, then wash. If the stain is persistent, you can spray the stain with Easy-Off oven cleaner, let set for about 30 minutes, then launder. Test this on a non-visible area first to check for color fastness in your pants. I would recommend washing the pants in cold or warm water, as hot water will cause them to fade and wear faster.