I have been using ME for years on all my carts, including the one in my avatar. I have never thought it was going to do any harm to my carts, as long as you go up and down ONLY. You start going sideways and dragging the stylus across the ME surface your asking for trouble. I also do not press down, I let the weight of the cart do the cleaning, 2-3 dunks is all that's needed. I then look at stylus thru jewelers loupe and see nice bright shiny diamond tip.
I also use my dust cover.....every house has dust flying around.
I also use my dust cover.....every house has dust flying around.