Which part of the video exactly? There are hundreds of effects in that video that can be done with simple text animators or require 3rd party effects like Newton or or standard features like displacement maps, shape animators or masking. Pause the video on the effect you want to duplicate, take a screenshot and post it on the forum by dragging it to the reply window or using the little came icon to upload it and we can point you in the right direction.
BTW, a great deal of experience with AE is required to replicate this video. I didn't see anything that looked like erasing dust except for maybe this part:
Which may be done with Shatter and a custom shatter map or with a particle system.
Yup this is the exact part I was talking about!
Ohh never thought of shatter. I'll experiment with it. How do you get that look of the powder as it shatters. Is there any tutorial you could point me to?