I avoid steel wool as it will scratch. Chemically treating with oxalic acid, or Evaporust is better. Degrease the surface first. Or electrolysis works. For convenience and effectiveness use Evaporust.
any markings on the back of the rear derailleur?
Rear of the derailleur has - 5 Vit Chaine 238
1 Attachment
correct for your 5 speed (3/32")
@SideshowBob started
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I avoid steel wool as it will scratch.
Chemically treating with oxalic acid, or Evaporust is better. Degrease the surface first.
Or electrolysis works.
For convenience and effectiveness use Evaporust.
any markings on the back of the rear derailleur?