You might try ...
http://www.soundbasemegastore.com/aerosols/26108-servisol-super-10-switch-cleaning-lubricant-5015972042694.html
Also Amazon £4.79 post free
http://www.amazon.co.uk/Brand-Servisol-Professional-Switch-Cleaner/dp/B000KHE1D0/ref=sr_1_1?ie=UTF8&qid=1369897742&sr=8-1&keywords=servisol
Peccavi
May 2013