Yes,even I didn`t belive,there is of course special aperture to desulfate but $$$. Good thing for today`s teen plate recycled battery which they sold as NEW,as I read no. 1 reason for that is sulfate that plate.Just use MOTOR cap,not ordinary one and go,you will see big +++++,but as always,it`s better on not totaly sulfate battery.Do it many times it helps a lot,but from grandma can`t be girl.
ps. Old and smart guys tell that in dark and from back you will never see difference.
