Adsense allows you to remove +1 from Ads using the "Allow and Block Ads" setting in your Adsense acounts.
Google Adsense terms these +1 as Social Ads.I wanted to remove +1 as my ads on jahajee.com were customised for my website and also +1 was of no use to me. To remove +1 you need to
login to your Adsense account >> Allow and Block Ads >> Ads serving >> Social Ads
According to Adsense
You can choose whether to allow Google +1 related features and annotations, such as the +1 button, on ads that appear on your pages. Allowing these features and annotations increases the likelihood that visitors to your pages will see ads their social connections have +1’d. Blocking the Social Ads will remove unwanted +1 from adsense ads to get simple textual ads.