I have cleaned it a few times with lighter fluid then applied thin lube. My magicyoyo N9 does not sleep very long maybe 30 seconds and i have had is about 3 months or so. I did not clean it recently.
Yucky looking? Oh gross. We can’t have that. Before you know it, it’ll change to ‘ewwy’.
Is there a problem with it because the fact that it doesn’t look 100% brand new (because it’s not)? Thankfully you’ll barely have to see that awful thing since it’s hidden in the middle of your yoyo. It’s just a shame that you have to suffer with the mere thought of a yucky bearing.
Bearings aren’t good forever. Especially the cheap Chinese concaves that ship with Magic YoYos. They’re all I use and they’re pretty hit or miss longevity-wise.