You know what I'm talking about, right? That dark grey sludge that builds up on hand rails over the years? I inherited a case of sludgy hand-rails when I bought my first house and I'd like to clean them.
I've tried using lemon oil-based polish and lots of scrubbing. It helps to an extent, but only on lightly trafficked parts of the rails.
Can anyone recommend a cleaner that will help dissolve this junk but not harm (and preferably protect) the varnished wood?