You probably have already taken care of all of the cleaning and re-lubing on your bike, but have you cleaned your helmet?
You sweated in it all last year, and it is probably smelling pretty funky by now.
Easiest way to clean it? Take a shower.
Seriously, take your helmet into the shower with you.
Taken with my iPhone. Don't try this at home, unless you have a LifeProof case!
Get it nice and wet, and give the whole thing - especially the straps and pads a good scrubbing with some soap.
After you get out, dry it off, remove the pads and let it air dry.
There you go! Your helmet is now de-funkified, and ready for another season of riding.