You only need to clean out the spool bearings, much as the same as bait casting reels have spool bearings. Generally there are two spool bearings on the spool shaft. All you need to do is wash the spool bearings, make sure to dry them off, then reapply one drop of oil onto them.
Personally I have not done so on my newer reels since they come with good oil in them as oppose to like over 15 years ago when manufactures just put cheap oil in them and one sort of needed to clean them out straight out of the box. I give the spool bearings an acetone bath wash, spin them dry in a few minutes and apply one drop of oil, spin them, and them put back into reel, then spin the spool. Yeah, I do go backyard test cast and see the world of difference.
Then again, what works well in a warmed up shack, sometimes is sluggish out in the cold temps.