Cleaning silver with aluminum
Aluminium is just a catalyst (is not consumed) in this reaction

Silver sulfides are in theory reformed back into silver, so none should be lost. In practice the sulfides will have moved the silver away from the main surface with pitting etc, so some silver will be lost, but there is no product that can put the silver back in place anyway

A large surface area of aluminium, and plenty of heat improves the reaction

In the days before marketing companies selling us crap in cans, people used to use a purpose made sheet of (rather impure) aluminum for this very purpose, it had hundreds of tiny holes punched into it to improve the surface area