Cleaning the pro back is a "dream".
You have total access to the sensor, and you have a company that has no issues the end user cleaning the sensor.
E pads refers to the older sensor swabs, now you have several options from either visable dust or sensor swab. You would want to full swab meant for a true sized 35mm camera. I don't believe they make one for the large medium format sensors.
Many will create their own swab, many articles on this out on the web, then use the pec pads.
I have only ued the swabs and they do fine. However with the sensor brush, most times that's all you need unless it's a very bad spot.
On AA or IR filter, you can use the same method, however they are very fragile and I have applied too much pressure once and broke an IR filter.