I just received my pair of Vass Museum Cognac Double Monks(same as Renault78law) and asked Rezso about renovateur and polishing products. Here's his reply:
"I am using renovator rarely. Mostly wax polish. The matching one to each color. For museum calf brown I am using brown and each year once the neutral color. For gold I am using maroon, tan or light brown."
He also uses Bergol products that you can find here:
He especially likes palm wax.