I use buff on every new yoyo and re apply after a month or so of heavy play. Smells like heaven, helps withgrinds, and makes em look tip top!! Big fan of buff. I little tub lasts a long time!
Also just wanted to note, i took every cloud string i have in use right now ranging from 5 hours to 30+ hours of play times. Took em all, washed em nice and clean, layed them our (hung them up rather) to dry, and I could not tell which one was mostly new and which one has a ton of play on it. Just thought it was funny even I couldnt tell. Just wanted to share. 