My dishwasher doesn't have a pre-rinse basin, either. But, I've found that for heavily soiled loads, if I throw an extra pod into the bottom of the dishwasher

My dishwasher doesn't have a pre-rinse basin, either. But, I've found that for heavily soiled loads, if I throw an extra pod into the bottom of the dishwasher before I run it, that helps. (The extra pod will be dissolved in the first rinse, giving a boost.)