I usually just pick my horse's hooves out anytime I'm handling them for riding or training. Their days off from work their hooves usually don't get picked out. But picking out daily should be fine.
I would think rinsing them off with the hose daily would be fine as well - as long as they get put someplace dry afterwards so their hooves have a chance to dry out. This is not needed by any means and you could easily stop this all together if you wanted. I only rinse hooves off if they are super muddy and they are going to get a trim.
I think I would stop with the soap and water though. Soap tends to pull out oils and could potentially dry the hoof of natural oils and lead to cracking.