Cleaning blinds

We have some pleated blinds at the cabin windows. I take them home and wash them gently in warm water in the bath with help from some laundry liquid and perhaps a small paintbrush for the black spots probably left by the spiders .

We have venetian blinds in the saloon . We can't see how to remove them . So they have to be cleaned in situ. My chief officer says the easiest way is to rotate the blades to the closed position and wipe with a damp cloth then a tea towel to dry. No special tool required. I am sure we have one of the special tools but don't think it was very successful.
 
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