>He typically washes his clothes in a top loader, not sure what brand or what >detergent.
Andrew, this is merely SPECULATION on my part, but if he's the average single male who comes home greasy and maybe does laundry every couple of weeks, chances are he's using a cheap detergent (Extra, Purex, Fab, etc.). I'd do my best to sell him on the benefits of Tide or another P&G brand, or even Wisk or All (and maybe even Arm and Hammer).
Does he do his laundry at home or a laundromat? Now that he's experienced what a front load machine can do, he'll start using one of those (at a laundromat) instead.
Maybe now that he's seen how much better his clothes look, he'll make the switch.