This a problem with Vesconite and Devol. I install grease seals top and bottom of axle tube to reduce this harmful grit/paste. It works to a degree I think. Also the Gaiter's are a help. But I can find some damage to My Hard Chromed KP's if I look thru a magnifying glass. Where You live and drive is also an issue. Texas, not good. Western Washington, better still not really good. Eastern Washington and Oregon, terrible!
Just been watching Winfried Flugsand classic
movie and there is a scene in there that evokes my irrational gaiter phobia. When the car bottoms it exposes a lot of pin. If there was a gaiter attached to the stub the rebound spring would be dragged up the pin by the gaiter. Normally the spring wear on the pin is confined to the bottom of the pin but with a gaiter hugging the spring the spring would be taken to new heights. It wouldn’t take much for the tough steel spring to rub off the thou or so of hard chrome surface on a chromed pin. Might this be the damage you see through your magnifying glass?