In this case prevention is better than cure ...
Give the bike the best clean its ever had and dry it off using a hairdryer/leaf blower. Then give everything metal/alloy (except brake discs of course) a good coating ACF50 to help prevent corrosion in the first place, using a stiff bristle brush to get the ACF worked into nooks and crannies including bolt heads.
Give the bike a cold water hose down after each use if possibe, but if you are using the bike daily then hose down as frequently as possible to get the road crud & salt off before it gets a chance to cause corrosion.
You are looking to get a long lasting protective barrier on the bike. WD40 also works but to a lesser extent.