CLR Spill on Man-Made Granite Vanity Top
I left a sponge damp with CLR on my black vanity top leaving a white mark with the sponge shape.
You say "man-made granite". Well, there's no such thing unless you mean a "quartz countertop", which is man-made to look like granite.
So, if we are talking about a quartz countertop, then the light-colored spot is likely permanent damage caused by the CLR (Calcium, Lime, Rust remover), which is highly acidic.
Unfortunately, when damaged quartz is near impossible to repair. Scratches can be repaired, but the binding and coloring resin that quartz is made with is susceptible to chemical damage from things like bleach, CLR and other chemicals.
These chemicals will discolor the resin (usually lighter) and there is nothing that can be done to restore the color like you can with natural stone.
Still, I'd suggest contacting the manufacturer to see if a solution has possibly been created/discovered for this issue.