After further research, I heard that soap and water is the best for black, keeping in mind how applied, due to the electronics. Wax and silicones of any kind should be avoided on Matte surfaces according to Specialized dealer, which is my non ebike.
For cleaning my ebike I use an atomizer to spray the water onto a diaper rag and wipe the bike. This is a for sure way to contain any liquid from getting in the wrong place in addition to potential shock issues, which I would hope would not arise regardless. I went with White on saturday to avoid the dilemma.