>>2660251>Bundeswehr boot polishThe lidlhog strikes again.
Top grain leather needs regular greasing to remain usable as it will dry and crack otherwise, it makes it waterproof too. I recommend you use a specific product made exclusively from natural greases, petroleum ones penetrates too much which will give issues or outright ruin the piece.
You don't need to melt it, scoop a little with your fingers and pull it with your palm, covering the outside of the boots completely with a thin uniform veil, insisting on folds and seams.
Once a month is too much, normally once or twice or more a year, depending on usage.
Polish doesn't need to be given weekly, next time simply rub them with a rag; you should reapply polish only when it becomes impossible to shine them like this. Too much care ruins the boots.
I have an old manual stating you can use a mixture of lard, honey and beeswax in equal parts in lieu of grease, try that at your own risk.