In my most humble opinion there is no such thing as 'dry steam'.
steam is water vapour and when it cools will turn back into water. The term 'dry steam' is simply that the steam comes out at a higher temprature and so drys quicker. I feel it is just a marketing ploy?
for ovens i use TO4 cleaner, heat oven, switch off, spray in the TO4, leave for 20 mins, apply elbow grease(with scourer). works a treat every time.
by the way while we/I are on the subject of ovens has anyone tried soaking the racks in soda crystals and does it work?
Regards
Martin