I better get home and dunk them in a big vat of superglue!So I have had pretty good success using a bit of superglue over any spot that shows stn/rtn A few of mine showed a small amount of RTN and I used superglue over the spots and it has stopped for the past 4 days now. I have done this in the past with more success than not just an idea.
In all seriousness, I too have heard of this being a successful method for some STN issues. I do wonder why this works successfully though and haven't necessarily tried it myself.