Corroded fuses can cause intermittent and mysterious electrical problems. I like to clean the fuseholder clips about once a year and then coat the ends of the fuses with "Oxguard". It is a special paste that prevents corrosion on electrical connections. It comes in a tube like toothpaste and can be purchased at hardware or home improvement stores in the electrical department. I use it on all light bulbs and 12 volt connector plugs too.
I would not use Oxguard on any low current connectors such as fuel injection plugs because it could possibly affect the electrical signal. Any input on that this from the experts would be appreciated.