The easiest way I know to explain is that yes, scratches can stop cleaners and sanitizes from getting down in the crevices of the scratches. There is a lengthy explainantion if you google it, but simplified it's kinda like serface tension that creates a little air gap and stops the goodies from getting in and killing the baddies.
Surface tension, I can buy that. But boy howdy those scratches would have to be TINY!