I KNOW this sounds crazy, but I LIKE washing the parts down before assemble an building an painting(Don't usually get much past the primer stage!) caz it makes me feel like it's a personal thing with the model. I like lookin the trees over as i wash them, and seein what parts are fragile an reguire attention, and checkin the body out for dips in the panels and parts. i dunno, I guess it's just me. If we gonna spend time together, might as well get to know each other.