I've been using this combination for a year or so and it seems to work well. I mixed WD40 and water about 50/50 in a pepper sauce bottle and with a good shake it forms what looks like the elusive moose milk. It separated overnight into a white solution on top and a milky water on the bottom. A few days ago I gave it a shot of dish soap and shook it up. So far it hasn't separated. 4 or 5 wet patches followed by a dry one and then a patch with straight WD has been working very well with no after rust. It beats the hot water I've been using forever.
This is a great way to buy WD40;
https://www.amazon.com/WD-40-Multi-...W,B078XCD8QY,B000BXOGHY,B00IAJVVSI,B00631GZEU
This is a great way to buy WD40;
https://www.amazon.com/WD-40-Multi-...W,B078XCD8QY,B000BXOGHY,B00IAJVVSI,B00631GZEU