Get an oscilating fan on that thing and it will have a tree trunk in no time. Look at the wonders it worked on the girls I had under cfls. (in my sig) Also, don't worry about touching leaves, plants are tough. And I wouldn't worry about that white water spot on the leaves, some of my plants had that from where water splashed up on them and nothing happened. You should brush dirt off though, it blocks light and causes a yellow spot if it sits on the leaf. If you add a very little bit of liquid dish soap in your water it acts as a wetting agent and lets its saturate the dirt better and it won't bead up on leaves and leave water rings. It wets leaves evenly. Give it a shot, it won't hurt them. You could also dilute the soap in water and spray it on the leaves to mist them instead of wiping if you still don't wanna touch the leaf.