yeah i knew what you meant
When I ran a porty I used to use my 5L gloria for my "main" pre-spray for the job, whatever that was (normally m-power) I also kept a cheap plastic sprayer with fine cone jet permanently filled with a very strong mix of HD (about 1:10 I think). The purpose of which was to use as an over-spray on traffic lanes or arms of suites etc, after they'd already dwelled with the main pre-spray on them.
I quite oftne used to spray m-power, quickly whizz over it with the groomer and leave it to dwell whilst setting up the machine etc, then overspray with HD and agitate the traffic lanes with the duo, by which time the water was hot and everything ready to extract. Was a system that worked very well!