No they are not. Some deck washes are strong enough to remove old finishes some are not. But even using a strong deck wash may cause lifting of the fresh coat if not thoroughly washed off. Even leaving a small amount could leave the door open for film deterioration. Secondly, deck washes cause the grain to open.
Tight grain is the optimum for a fine finish.
As long as you maintain the surface in a clean state and no scratches from pets with long sharp nails, all that will be needed is a thorough washing, possibly a mild pressure washing. Rhinoguard is a high vehicle solids finish. Garden chemical pump sprayers are designed to handle chemical water solutions. Coatings that can be successfully put through such a device are really gimmicks that quickly disappear, with miniscule or no surface protection. It is the medium that carries any pigment present and it is the portion of the system that forms the coating's film.