Umm that's never happened to me. All my pieces (check my gallery, I have a lot) come out aquafina sparkling.
your pieces OUTSIDES may be aquafina sparkling but the insides to those are not. They are covered with resin all over the sides, which will in turn taint the flavor of the bud that you smoke through them.
Thats not really alot of pipes either. I suppose that is okay collection for someone who dosent smoke a whole lot though. the reason i say that you dont smoke a whole lot is because heavy smokers HAVE to clean their pipes every 6-8 months @ least. i usually clean mine about every four months though because it taste better.
get a paperclip, straighten it out, and then make a hook about this ling @ the end -> -. dig that thing around in there and look at what comes out on it. Oh and thats the way i clean my bowl....heat it up a bit and dig everything out, then rinse with alcohol for a bit to get the remains out. rinse dry and smoke out of the just like new pipe.