Do both. Use GT85 to clean out gunk. Liberally spray it in, if you have access to the balls then wipe them clean. Then put in thick grease.
@DFP started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Do both. Use GT85 to clean out gunk. Liberally spray it in, if you have access to the balls then wipe them clean. Then put in thick grease.