[RPWC]

Originally Posted by Jordan Apex

Melamine sponges will rub off the protective coating of the leather if used frequently, it will make them susceptible to damage in the future if the coating wears away.

They're good for deep cleaning but I'd only use them once to get the seats to the desired standard and then maintain

Hence my additional sentence saying that they will need to be treated afterwards with some sort of leather cream, to stop the leather drying out.