The wearing of face masks whilst working

[Bob Olive]

When I did my basic training in the Colonial Police in Northern Rhodesia in 1960, we wore goggles and gas masks when performing 'riot control'.  The solution to goggles steaming up in the African heat was to rub a VERY thin film of quite stiff grease on the inside of the lenses.  Thankfully after training I moved to a plain clothes unit and thus was never required to test this theory. If you can find some, it was called 'makwala'...