They will clean up with as mentioned wire wool or fine wet and dry, but may cause leaks if the pitting is to bad, when cleaning the pitting off them don’t go up and down go but around the leg, if pitting is deep you can as a bodge add a strong glue in the pit mark then flat it down to the level of the chrome, but if you are going to do things correctly and put new springs in get them re chromed or replace the stanchions.
With the hyper pro springs they do stick out the tops more than the standard springs and getting the caps on is a bit of a struggle.