Is this a needed tool or..

[aussiblue]

Or just tool companies trying to create demand; fuses terminal cleaners e.g. https://www.youtube.com/watch?v=_UQn0RfrEnE ? I don't think it anything I have ever needed and if I did I might just disconnect the battery and re-purpose an old points file. But perhaps with engine bay fuse boxes becoming more common and thus fuse terminals thus becoming more exposed to water and in some places salt.... Now a relay socket cleaning file is something that I could often have really used (on those relays in the E series next to the coolant recovery tank) ; where the old points file and contact cleaner spray wasn't also really doing the job easily. Hmm perhaps these: https://www.mcmaster.com/products/relay-cleaners/