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spotted this thing the other day and was curious
If there's one thing you should avoid even more than ceramic bearings, it's cheap ceramic bearings :-)
Shimano BB-R60 is the #tester_approved HT2 BB, cheap enough to be considered a service item. If you want it to come out easily, use Copaslip on the threads. I mean, use Copaslip anyway, but I've had stuff come out like new which has been put together with Copaslip two decades earlier. Ordinary lubrication grease will wash out and/or dry out much sooner, as you have discovered.
Fixed the link, I hope. And yep, was a hollowtech 2. Got a Tiagra one in there now but spotted this thing the other day and was curious.