In article ,
Huge wrote:

We used to take the spark plugs out of the Austin 12 and put them in
the oven or over the gas hob though in retrospect I'm not sure what
good it actually did.

I use a blowtorch on the mower spark plug when it's being particularly
troublesome. Seems to help.

For some reason I'm thinking Basil Fawlty ... :-D