He worked over the past three weeks and before to rub the tarnish off his image.
From the sportsillustrated.cnn.com
Ringers wear white gloves so the oil from their hands doesn't tarnish the bells.
From the dailynews.com
Now the president and his party have done much to tarnish those accomplishments.
From the charlotteobserver.com
The effort to tarnish Bruno was the first major blunder of Spitzer's first term.
From the timesunion.com
However I don't think we need to tarnish Mendelian genetics in order to do this.
From the en.wikipedia.org
Certainly if he institutes a 3 line whip it will tarnish his reputation forever.
From the guardian.co.uk
This season seems to have done little to tarnish his cred among football people.
From the stltoday.com
Democrats have sought to use Akin's views to tarnish Republicans in other races.
From the latimes.com
I use them daily, so they tarnish quickly and take way too much time to polish.
From the sacbee.com
More examples
Discoloration of metal surface caused by oxidation
Make dirty or spotty, as by exposure to air; also used metaphorically; "The silver was tarnished by the long exposure to the air"; "Her reputation was sullied after the affair with a married man"
Tarnish is a thin layer that forms over copper, brass, silver, aluminum, and other semi-reactive metals as their outermost layer undergoes a chemical reaction. Tarnish is mainly caused by chemicals in the air, such as sulfur dioxide. ...
(Tarnishing) Natural aging process of bronze and other alloys exposed to air. May be retarded by protectional lacquering or waxing which in turn muffles the sound
(Tarnishing (Mirroring)) Tarnishing refers to a form of age deterioration found on a photograph manifesting as a metallic sheen within its darker values. Processing residue or silver, migrating out from the image can form a very noticeable surface crust that takes on various colors. ...
Tarnishing is a layer of corrosion that is formed on the surface of metals or alloys. Well-known is the tarnishing of silver and its alloys. It is mainly caused by degrading agents present in the atmosphere such as sulphur. It appears as a gray or black film over the metal.
(tarnishment) a form of dilution that occurs when a famous mark is damaged by an unpleasant or unwholesome use of a similar mark.
Surface discoloration of a metal caused by formation of a thin film of corrosion product.
Verb meaning to discolour metal by exposing it to air so that oxides, such as rust, form