With a soft sponge clean the blinds from side to side and top to bottom.
Cleaning metal window blinds.
This keeps it from spraying backwards and ending up on the blinds where it can attract dirt and dust.
Put a few drops of dishwashing soap in a bucket of water.
Mix in a little mild dishwashing soap.
Dip a sponge in the solution and wipe down each slat.
Wet a car washing brush and brush the blinds from side to side and then turn them over and brush the other side.
Remove the window blinds from the window and hang it from the hooks.
Another preventative measure you can take is to always spray window cleaner on a paper towel or rag and never on the window itself.
Take the blinds outside to your patio or driveway and lay them on a small rug or piece of carpet.
If the blinds are plastic or metal and you want to leave them in place to clean them make a 50 50 solution of warm water and white vinegar in a bowl or bucket.
Finish by wiping each slat again with a sponge dampened in fresh clean water.