Tony Clayton wrote:

I would not advise petrol (or gasoline for our US friends) as there
are too many additives. ...

If you mean motor fuel, you are right. I meant the lighter
grade of liquid hydrocarbons which is known as "Leichtbenzin"
in Germany (and sold in pharmacies), and yes, it has many
other names like cleansing petrol, lighter fluid, ... and
your warnings apply to it, too (and even more so).

Jan-Martin