Polish Helps Remove This From Silver

This page is the CodyCross answer for the clue below from House of Horrors, Group 1111, Puzzle 4 (Mad Scientist).

Question is: Polish Helps Remove This From Silver

and the answer is: TARNISH

Word Meaning:

TARNISH — Oxidation or discoloration, especially of a decorative metal exposed to air.

Definitions from Wiktionary.