The sphere is made of carbon fiber and is painted with standard interior wall paint.
During sphere installations, we use Fantastic or 409 cleaning products with a cotton rag to clean off any marks or dirty spots that appear on the sphere. We've also had good results with Mr Clean Magic Eraser-style Melamine Foam cleaning blocks. For spots where those cleaning products don't work, you can use sandpaper to buff out the spots and then touch up with new paint as necessary.
We use Behr Premium Plus, Interior Flat, Ultra Pure White 1050 with a 4"
foam roller at all the sphere installations. It can be found at Home Depot here.