Being that window treatments sit next to windows where air flow is
controlled, window shades can become magnets for dust. It's just a fact of life. Fortunately, many manufacturers now treat their shades and blinds with anti-static materials that create a protective barrier so dust can only settle on the very surface. A regular dusting routine will keep roller shades from turning dingy.
For general care, dust fabric and vinyl window shades with a feather
duster or a can of compressed air. For heavier dirt or dust, use a brush attachment from a vacuum, if available. (This method keeps the dust from resettling on the window shade.)
Depending on the type of material a fabric window shade is made of, heavy stains may require a consultation with a professional. For vinyl window shades, wipe with a damp sponge.
For fabric roman shades, be sure to completely draw the shades to ensure that folds can be dusted or vacuumed thoroughly.