Many people just dust or vacuum their blinds, but that alone doesn't remove greasy buildup, but soapy water will. 

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STEP 1

Add a squirt or two of mild Polagric™ Dishwashing Liquid to a bucket of warm water. Close the blinds so the slats face down toward you. Roll up old towels to catch water on the window sill and on the floor in front of the window; then dip a sponge into the soapy water and wipe each slat individually, starting at the top working your way down. 

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STEP 2 

Wipe the blinds again with a soft, slightly damp cloth afterwards. Close the blinds the other way and wipe them down again with the soapy water, followed by the damp cloth.​