Les's suggestions are good ones. I tend to use bleach on highlights that don't need that much more pushing, so three or four applications of relatively weak potassium ferricyanide are just enough usually just to get that little extra sparkle after I've done other things like dodging and adjusting contrast. Barnbaum uses bleaching more heavily than I do, it seems. It's particularly handy if you like graded papers like Azo and Cachet/Maco Expo which only come in two or three grades, making all the old tricks a real necessity.