I have used Stabilant 22 for a number of years ,
then went in 3 ways on a larger bottle ,
the 1260 = the 2520 is excellent I gave it a thin coat waited 2 weeks and reapplied ,Excellent results ,if you don’t touch good for years ,do all including all Ac blades ,the key Very important is cleaning Every contact rca,xlr with high purity Isopropyl alcohol on quality swabs .I use the Caig swabs for the cheap foam swabs the alcohol melts the adhesive on the swabs
AC outlets should be copper ,gold even on AC connectors,for brass Hubble or other type
a black oxide forms which robs detail yes even on the AC line.