Originally Posted by
practical
You've received some good advice but I will add another bit. The spring under your front derailleur is very susceptible to rusting so spray it with some WD40 every now and then.
No, do NOT use WD40 on your bike, anywhere, ever. It is a solvent, not a lubricant.
Anything that moves or is susceptible to corrosion needs a proper lubricant. Oil if you like wet-lubes that only need to be applied infrequently, or a good quality teflon and wax based dry lube if you want something less messy that needs to be applied more often.
But NEVER WD40 anywhere on your bike.
Cheers
TRJB