Not in my experience. I've only bottled twice, but I turn them upside down on a paper towel and leave them for a few minutes. I'd say that gets em 90%. That should be fine.
Something you may want to look into is a vinator. Put your cleaned bottles on the nipple and pump a few times and the sanatizing solution coats the whole bottle. Star San works great for that and you can throw the bottle caps in there to sanatize as well.
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