The rims on my commute bike are showing wear on the brake track. These are Mavic Open Pros. The grooved brake track is smooth now, with a perceptible but not really measurable ridge at the edge. I've ridden these rims for two years, every weekday, and a couple of centuries. The pads are KoolStop inserts for Shimano carriers.

How can I slow the rim wear? Replace brake pads more often? Clean rims frequently? Do those make much difference? How much longer might the rims last? I like these wheels and while I can rebuild them, I was not hoping to do so as often as every few years.