Eyewash
/ˈaɪwɑːʃ/
Definition 1 of 2
Pro Tip 1/3Deceptive Language
Used to indicate fake or insincere actions meant to look good. 
The company's commitment to the environment is eyewash to win customers.
Pro Tip 2/3Skeptical Tone
Conveys disbelief or doubt about someone's sincerity or intentions. 
Her excuse for being late felt like eyewash, considering her past.
Pro Tip 3/3Subtle Insinuation
Implies that there is more to the situation than meets the eye. 
He says he donates to charity, but it's just eyewash, isn't it?