A few years ago, I was shooting a lot of nature and out of necessity having to change lenses in the field. As a result I was accumulating a lot of dust/dirt on my sensor filter. Against the advice of my dealer and after watching the video on the Phase One 2 part sensor cleaning package, I ordered the product and followed the instructions.
I caked up my sensor filter with the part A solution and could not remove the residue with part B and the wipes even after many multiple attempts. I sent the back to Hasselblad for cleaning and they returned my back perfectly clean.
To say I was relieved is a huge understatement.
I called Hasselblad in New Jersey and asked to speak to the person who had done the actual cleaning on my back.
He told me that he was trained to use the Eclipse solution, and his success rate was 100%; he further stated that he had seen some really dirty sensors which required multiple Eclipse passes.
I retained the plastic card that came with the Phase One package; my cleaning procedure today is multiple layers of the Eclipse wipe around the card.After each pass with moderate pressure at about a 30 degree angle, I relocate the wipe on the plastic card before another pass over the sensor filter.
Happy to report that this method insures an immaculate sensor filter, and I find myself cleaning the back after every outdoor use of the camera.
While Hasselblad skirts the issue, the HD5 appears to me to be more dust proof than the HD4- have no evidence of this just my impression when I took apart the demo I saw recently
Stanley