I have found this product at Jaycar that seems to be a good addition to the toolkit to eliminate those errors caused by dirty/corroded contacts.
http://www.jaycar.co.nz/productView.asp?ID=NS1436&keywords=deoxit&form=KEYWORD
Manufacturers website
http://www.caig.com/
http://www.jaycar.co.nz/productView.asp?ID=NS1436&keywords=deoxit&form=KEYWORD
Manufacturers website
http://www.caig.com/