How to clean my mountain bike transmission?
1. Disassemble the chain, sprocket and derailleur from your bike
2. Remove the shifter/gear cable assembly
3. Use a soft-bristled brush or cloth to remove any dirt, grime or oil from the inside of the gearbox case (you can use isopropyl alcohol for extra cleaning)
4. Wipe down all parts with a damp cloth
5. Reassemble the bike and check that everything fits correctly before riding it again
6. If you encounter any problems while cycling, make sure to disassemble the bicycle once more and clean all components thoroughly
7. It's recommended to periodically inspect and maintain your bike to ensure its continued safety and performance.