Actually, be very careful with erasers. It depends on what kind of stain you've got. If it's a color transfer stain it could work, but if it's dirt - it might smudge it in deeper. Magic eraser for example works magic, BUT the more you use it the faster dirt sticks right back, since you're actually removing a protective top coat each time you erase the grease away. If you over do it (I did once upon a time) you might ruin vachetta completely, because it will absorb moisture and sun 10 times quicker, and therefore turn faster not to mention it will be so dry like a sand paper.
From my own experience I would suggest not to use any kind of erasers on any LV unless you have a very ugly, can't live with- ugly stain. Apple guarde kind of slows down a patina a little bit, but I've noticed that when a bag finally turns - it kind of has a grayish tone to it. After I ruined one of my bags with all of my "keep vachetta clean" experiments. I let all my LVs go natural.
I got my Azur speedy on NOV 1 and have used it ever since. Let me tell you there IS a period when it just starts turning but not quiet there yet...when all you notice is a dirt on the handles, BUT once you start seeing a golden undertone on that vachetta - it just takes your breath away. My speedy is now very light honey color and it's just beautiful, I would never trade it for a brand new one, really.
•Quick tip to minimize dirt on those virgin handles - wipe them with nose tissues (any brand) after each use. you have to apply a bit of pressure - when you see a dirt residue left on he tissue you know you doing it right.
Sorry for the long post, HTH