I've indeed heard of using dish soap as wetting agent, mostly in the context of do-it-yourself photographic chemicals, like Caffenol for developing and water for stop bath.
Regarding Mainecoon's remark about isopropyl alcohol: I haven't heard of using it by itself, but many people swear that using it for part of the wetting solution instead of water will make the film dry faster.
Alcohol has long been used to speed drying times, for example English watercolourist would add a bit of gin or other liquor to their mixing/wash water (wash as in a large pre-wetted area on the WC PAPER, for effects, not washing off something) so the paper and paints would dry a little faster in the often damp English Country side.
If I thought there was a significant benefit to adding some alcohol to my wetting agent, I'd use it, likely Everclear Ethanol alcohol liquor, but I haven't so far.
By the way, for you non watercolourist, for watercolours, Ox Gall liquid has been and still is used as a 'wetting' agent, to break water tension for a smooth reception of paints, without the beading up of plain water on the starched wc papers.