[greatartiste]

Back in the late 80s I had a job servicing the 2 way radios used by bus drivers. Then you could smoke of buses & it caused a lot of problems not just for the passengers but for the electronics getting into volume controls , channel selector switches and that sort of thing. You would open up a radio and inside the contents had turned a yellowy brown colour , often it was impossible to make out the original colours of the wires. The trick was to put the entire radio circuit into a bath of luke warm water with washing up liquid. After 10 mins or so the nicotine residue would float up and form a yellow scum layer on top of the water. Quite disgusting.