Maisto makes very cool die cast display cars. Unfortunately, any RC they make is "toy" grade, unfortunately. There won't be anything you can do to improve speed, make it drift, or handle better. For cleaning, I'd recommend blowing the dust off it with compressed air, or a very soft cloth. Unsure about scratches, you can try automotive products but always test in areas that cant be seen first.
"When you no longer go for a gap, you are no longer a racing driver..." Ayrton Senna
"I dont like being overtaken. It's a sign of weakness." Jeremy Clarkson
"Leave me alone....I know what I'm doing." Kimi Raikkonen
I don't always race RC....but when I do....I prefer road course.