We found one dictionary that defines the word deruster:

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1. deruster: Wiktionary

Definitions from Wiktionary (deruster) ▸ noun:  A chemical that removes rust. ▸ Words similar to deruster ▸ Usage examples for deruster ▸ Idioms related to deruster ▸ Wikipedia articles (New!) ▸ Popular adjectives describing deruster ▸ Words that often appear near deruster ▸ Rhymes of deruster ▸ Invented words related to deruster