module ActionView::Helpers::SanitizeHelper::ClassMethods

def full_sanitizer

end
config.action_view.full_sanitizer = MySpecialSanitizer.new
class Application < Rails::Application

any object that responds to +sanitize+.
Gets the Rails::Html::FullSanitizer instance used by +strip_tags+. Replace with 
def full_sanitizer
  @full_sanitizer ||= sanitizer_vendor.full_sanitizer.new
end