Vaseline

Vaseline is a brand of petroleum jelly based products owned by Anglo-Dutch company Unilever. Products include plain petroleum jelly and a selection of skin creams, soaps, lotions, cleansers, deodorants and personal lubricants.

Vaseline in in The War That Came Early
When Sgt. Alistair Walsh finally deployed into the field during the Battle of France, he found conditions even worse than he had remembered from World War I. Trench foot was a problem but Walsh recalled a trick from the previous war, namely to rub Vaseline on your feet as thick as you could. He kept after his men and so only one soldier came down with trench foot.