Rust on back of JPX 919 Hot Metal

Jeremyhow

New Member
Joined
Feb 17, 2021
HCP
16
Local club/country
United States
Irons
JPX 919 Hot Metal 4 - PW
#1
Rust has started to form on the back of my irons. Is this indicative of a bigger problem or what should I do to remove the rust? The back has groves and indentations, so I was thinking of using Naval jelly to try and remove it as I saw this recommended on line. Any suggestions would be appreciated.
 

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