Well UM - Don't know about Whirlpool - but Kitchen Aid.
My mothers 1971 Kitchen Aid Superba had a soak cycle on it. Back then you purchased a separate enzyme additive named Pan Dandy from the folks that made Electrasol, to use in this part of the cycle - detergent cup one. It was basically the normal cycle with a soak period preceding it. I think it was 1.2 minute purge of water line to get hot water, 16.8 minute soak where The DW would spray the water, pause for several minutes, spray again....repeat this and then finally drain the water and start what would be the Normal cycle: 3.6 minute prewash, 3.6 minute pre rinse, 8.4 minute main wash, 3.6 minute first after rinse, 3.6 minute second after rinse, 4.8 minute final rinse, 22.8 minute dry, 1.2 minute timer advance - for a total like 69.6 minutes. Water used was 19.2 gallons.
If I remember correctly - this did a pretty good job. But 19 gallons....um...yeah