Whitening powder is commonly used by metal polishing professionals to remove the black from the aluminum after polishing. This dry powder can be used instead of flour or corn starch. Since whitening is a natural element it won't react adversely with external elements. When applied with a microfiber towelyou will easily remove left over residue or compound.
The powder is heavily used in the private market to also remove hand polish such as time 2 shine aluminum polish. Whitening powder is safe to use on both aluminum and stainless.