buff = polish

buff には磨くと言う意味もある。2:18 It's a silver Lexus. just pull it right up front. and don't scuff the paint, alright? I just had it buffed. おーい、ボーイさん。ここに俺のレクサスを回してくれ。ボディーに傷つけないようにな。ワックスをかけたばかりなんだから。

Key & Peele - Alien Imposters
https://www.youtube.com/watch?v=Ip7fbScSQNg  1:09 polished and buffed until it gleams
xclusive and Secure - Luxury safes from Döttling | Made in Germany
https://www.youtube.com/watch?v=vulQQ-YydTU  17:06 the biggest baddest buffing machine of them all.
Extreme Yachts | Season 2 Episode 1 | Full Episode
https://www.youtube.com/watch?v=6ChPbdD3zDk  3:01 the flat surface is then buffed with what looks like the unholy spawn of a dental drill and a floor sander.

https://www.youtube.com/watch?v=FrB5K5K0e0o  40:05 the custom paint job is hand-buffed.
MegaFactories LearJet (National Geographic Documentary)

参考リンク
http://bridge-english.blogspot.jp/2015/05/blog-post_32.html  愛好家を英語でなんと言うか？

練習問題解答
a-5320 buffed
b-3073 buff it