Ask a Mechanic: De-Gunking Your Front Derailleur Ask a Mechanic: De-Gunking Your Front Derailleur Greg O'Keeffe2016-04-22T09:38:40-08:00 Brooke asks “I’ve noticed that most hydration mixes are incredibly sticky and gummy when Ask a Mechanic: De-Gunking Your Front DerailleurGreg O'Keeffe2016-04-22T09:38:40-08:00