I used a waterless shampoo by Top Paw from Petsmart to wash my Schnauzer’s beard. It did a wonderful job of cleaning. But when dry the hair is super dry looking. Sorry hard to describe (think dry and fizzy) So instead of a nice schnauzer beard (or a Col Sanders look) I have beard hairs going in every direction.
I did use a wet hand towel to rinse after using the shampoo. I rang it out and repeated with a warm wet cloth until I no longer saw dirt on the cloth. And then when dry I uses a wire slicker brush on the beard.
I feel like I need to use a conditioner on the beard now. lol.