How can I clean pleated soft shades?

In our last home we had the HUNTER DOUGLAS pleated shades everywhere. I never did find a way to “clean” them. I ran the vacuum over them once a week, but they still looked dirty….
I thought about taking them down & putting them in the bathtub with woolite & then hanging them to dry, but What if that didn’t work?? Then we would have NO blinds anywhere until I could get more ordered. I waitied it out….. I knew our new house would be done in the next few months, so I waited… Then we moved out…..
Our new house has Pella windows & doors with the 3 pane design. The muntin bars (grill look) between one set & the insulated, pleated blinds between the other. NO MORE CLEANING BLINDS!!!!!!

Sorry!! I know that wasn’t any help…..