I am not sure they can be saved.
They can with a part washer.
I'm never sure about gumwalls and part washers, given what it does to human skin what does it do to natural rubber?
Old part washer chemical were very harmful, the new one is less harmful and only need a disposible glove to protect your hand.
Plus it’s not gonna be soaked in the part washer, just clean off the dirt with the brush.
@spotter started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
They can with a part washer.