Google 'electrolytic rust removal' if you want cheap, although it will probably involve a bit of DIY. I've used epsom salts as the electrolyte and disposed of the used liquid in the garden without any obvious problems.
Cheers. I'll have read up.
@hugo7 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Google 'electrolytic rust removal' if you want cheap, although it will probably involve a bit of DIY.
I've used epsom salts as the electrolyte and disposed of the used liquid in the garden without any obvious problems.