Im the same way, usually just water and then the usual bath once a month.i rinse mine in water when he gets dirty and give a bath once a month or so. Just make sure you get a dog shampoo and rinse rinse rinse
Twice a week? I have been told that twice a month is enough most of the times.I also wash my dog twice per week...that is a recommendation I got from my groomer. Not all groomers (pissedconsumer.com/browse-reviews/animal-services.html) are good the same, but I really do trust mine