Sounds like your nana was onto one of those “why didn’t I know this earlier” cleaning tricks.
Here’s the hack that usually fits exactly what you described:
You take an old sock (or microfiber cloth), slip it over your hand, and lightly dampen it with a mix of water + a splash of white vinegar. Then you just run your hand along each blind slat while pinching it between your fingers.
The vinegar cuts through dust and grime instantly, so instead of scrubbing, you’re basically just “wiping as you pass.” Each slat gets cleaned in one quick motion, and the sock traps the dust instead of spreading it around.
If you want the true lazy upgrade your nana probably meant, there’s an even faster version:
use a clean dryer sheet instead of a damp sock. It grabs dust like a magnet and leaves a slight anti-static layer, so the blinds stay cleaner longer.
For really dusty blinds, some people also do a quick vacuum pass first with a brush attachment, then finish with the sock/dryer sheet trick—still under a couple of minutes.
If you want, I can tailor it to vertical blinds or super greasy kitchen ones, because the method changes a bit there.
