Remove dust with vacuum cleaner or compressed air. Do not scrub.
Do not use solvents or any abrasive substance which might damage the coating of the fabric.
Clean with a sponge or a soft brush dipped in soapy water using mild detergent.
Rinse with clean water. Leave the blind down until completely dry.
You can also very gently rub the fabric with a clean white pencil eraser to remove small stains.