You can treat the "motor bay" of a Leaf the same way you'd treat the engine bay of a modern ICE car with complex electronics: carefully. I use the car wash wand, but don't try to pressure wash anything electrical with it. IOW I hold it a couple of feet or more away.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.