Volt owners have this issue with the Brandy/Black Gen II Volt interior. Polarized sunglasses for daytime, an inexpensive dash mat (available from multiple sources including eBay sellers) for all of the time. Here is a related thread from the Gen II Volt Forum: http://gm-volt.com/forum/showthread.php?269185-Anyone-have-windshield-reflection-problems-with-Brandy-interior&highlight=dash+mat
Also, this thread: http://gm-volt.com/forum/showthread.php?215049-Visibility-Issues-with-Light-Ash-Dark-Ash-Interior&highlight=dash+mat+ebay+seller
Because the Bolt is so new the dash mat sellers may not have had a chance to create a template for the Bolt dashboard. You might want to contact a few sellers and ask if they can create a dash mat for the Bolt, or when they expect to be able to offer the dash mat for the Bolt.
Also, this thread: http://gm-volt.com/forum/showthread.php?215049-Visibility-Issues-with-Light-Ash-Dark-Ash-Interior&highlight=dash+mat+ebay+seller
Because the Bolt is so new the dash mat sellers may not have had a chance to create a template for the Bolt dashboard. You might want to contact a few sellers and ask if they can create a dash mat for the Bolt, or when they expect to be able to offer the dash mat for the Bolt.
