Wooden blinds can be a total pain to clean, not to mention that they can take quite a bit of time to clean. There are a few different ways to tackle the blind cleaning job.
Using a sponge is the most effective way to clean. Use hot water and a small amount of dish soap to sponge them off. Then wipe them down with a dry cloth. If you have white wooden blinds, be sure to change the water frequently because dirty water can make them dingy.
If you can easily take the blinds down for cleaning, close the blinds and then carefully lay them on the floor. Then using the brush attachment on your vacuum cleaner, you can gently vacuum them clean. When one side is cleaned, flip over to clean the other side, then hang them back up in the window.