If it helps, GT85 is a good contact cleaner (as well as loads of other uses)
Big can with straw currently £2 at wiggle.co.uk
http://www.wiggle.co.uk/gt85/?dest=1&curr=GBP&utm_source=google&utm_term=Brand&utm_campaign=UK_Brand_Manufacturers_E&utm_medium=cpc&utm_content=mkwid|smo2kAjSZ_dm|pcrid|152237065428|pkw|wiggle%20gt85|pmt|e|prd|
"Not only is GT85 a powerful penetrating spray, but it also acts as a corrosion protective spray, dry film lubricant for precision parts, contact cleaner and lubricant (it is excellent for potentiometers, helping to eliminate electrical noise), water displacer, dielectric spray, high-temperature light lubricant, and a lubricant for assembly and packing"