Adjust slats to the up position. Dust both sides of metal or wooden blinds with a commercially treated dust cloth, or one you have sprayed with a household dusting product. You can also vacuum them with your machine's brush head attached. Readjust blinds to the down position and repeat the process. Vacuum fabric blinds or dust them with a dry cloth.
Wash the dusted metal blinds with a soft cloth dampened in warm water with or without a mild soap. Adjust the slats up, then down, wiping both sides. Wash fabric blinds in the same manner with a cloth lightly dampened in clean water only.
Fill a bathtub full of lukewarm water. Add a small amount of dish soap or general household cleaner. Slide metal blinds out of their brackets and place them in the tub. Gently wipe the blinds with a soft cloth. Rinse and dry them well before rehanging.
Clean wooden blinds with a soft cloth and lemon oil or a similar wood-cleaning oil. Adjust the blinds up and down, wiping both sides. Use a clean cloth to remove any oil residue.