Q:

The spring in my front dérailleur is jammed

My front derailleur is jammed by dirt (grease + fine dust), because of this the gear doesn't shift perfectly and chain is thrown off the cog. The spring is a bit unreachable because the derailleur arm comes in the way. How should I clean the spring and protect it from jamming again. 

A:

I went to my favorite cycle mechanic and he dropped kerosene on the derailleur and then brushed the dirt off easily. 

