Paint destroyed with eraser sponge

Hello guys, I had some dried up spots of bird droppings on my black polo and I didn’t get them off with water and soap. Idiotically, I tried it with such an eraser sponge, it worked too, but apparently the paint layer was also removed from it. The paint has become quite dull at the treated places. Looks really unsightly and it is also very eye-catching. Does anyone have an idea how to fix this? Mr President, ladies and gentlemen, I would like to thank you for all the help you have given me.