I recently accidentally smudged the encoder film of my MG3620 printer while tending to a paper jam situation (which did get resolved). I was reading here on Canon's website how to clean the encoder film, which seems simple enough. The trouble is in the article Canon specifies to use "neutral detergent" only, to clean the encoder film. I have no idea what neutral detergent is. When I went to google it and search for it on Amazon all types of detergent comes up, both laundry and dish detergent. Canon doesn't specify what it is, what brand, if it's dish, laundry, or something else altogether. They don't seem to sell their own cleaning product for this issue either. I don't want to ruin the encoder film purchasing the wrong type of detergent. Does anyone know what this neutral detergent is?