Cure For Battery Terminal Corrosion

[Lux]

Würth #0890104
It's what the professionals use.
Petroleum-based lubricants, like Vaseline and heavy-duty bearing grease, may have a tendency to:

• migrate in very hot weather (inherent weakness of low melting points)
• water out or gunk out
• interfere with conductivity after repeated handling... it's messy.

The Würth spray congeals in 10 seconds and is chemical- and corrosion-resistant.
Vaseline releases flammable vapours. I would not advise it.