Dry dusting these with a microfibre cloth should always be your starting point. Microfibre is static, static helps the dust stick - it’s a magnet effect. But when you add liquid of any kind? Water or a cleaning product? That dust turns to mud, and those strings that hold the blinds together get *really* dirty. So your blinds end up looking way, way worse. When I need to wet wipe them I spray my cleaner (@forallaustralia and water) straight onto my cloth: never the blinds. This controls the place