Re: flavor retention
well cleaning after every session isnt uber important but most a lot of people do do it. i have a friend that cleans his every week or 2 if hes smoking it a lot but he does clean the bowl, change the water, and blow out his hoses. but if you do it that way you just have to wash it more hard core when you do.
i rarely use lemon at all just because i clean it every time with jsut water and a brush and wipe it all out (i have a rotator so i dont need to brush the bowl since i can wipe it)