buff out
1. To remove or smooth out imperfections from a solid surface, such as metal, wood, or plastic, by applying a strong and consistent frictional force, especially from a buffing wheel. Somebody scratched my car! I'll have to take it to the shop to get it buffed out.
2. To conceal or remove minor flaws, imperfections, or damage, either physically (as from a surface) or figuratively (as from one's personality or background). Prior to his campaign, the candidate hired a PR firm to buff out some of his problems relating to younger voters. The groundskeeper buffed out the field ahead of the big game tonight.