I simply used gloves on my hands to brush the snow/ice off before unplugging when I parked the FFE outside.
The Bolt is currently outside and I'm doing the same thing--so far its a little worse than the FFE was as the way the Bolt's door closes leaves more snow behind it than the FFE's circle thing (surprisingly!).
2018 Cajun Red Chevy Bolt
2016 Magnetic C-Max Energi (lease returned)
2014 Sunset Escape
2014 Thor Axis (V-10)
2013 Focus Electric (lease returned Jan 2016 for the C-Max above)