I use any dog shampoo that is there when I need it.

I only bath the boys a couple of times a year, but if they go in the ocean, the get hosed down with fresh water after.

Bella gets professionally groomed about 4 times a year and not sure what the groomer uses, but she has an "old lady" smell (sort of a mix of coconut, baby power and hairspray) which lasts for about a week.

The thing I recommend to cut down on odor is a good brushing every couple of days.