Re is blinds

could somebody give me some advise in cleaning Remis concertina blinds

 

Have they got marks on them or are they just dusty?
You could try this on one slat to start with: Talcum powder, either puff it on or brush on lightly with a clean, dry paint brush ( about as wide as the slat, leave for about half an hour. Brush off excess with dry brush and then Hoover using soft brush attachment.

Or, if you have a steam cleaner maybe that would work, depends on if they are made from an absorbent material or not.