I've seen a few posts on here mentioning that people put their glass bottles through the dishwasher to clean them before sanitizing. Two questions ~ a) do you recommend using a dishwasher tab or not? b) Which way up do you put them in the dish washer? Upside down seems the obvious one, but how on earth does the water get in through the bottle neck. Its almost an embarrassing question to ask, but I can't understand how it works, and if they were the right way up, they wouldn't drain between dishwasher cycles.