i don't want to sound gross but I'm really tired of the gross gunk that builds up on my drip tips. is this something that happens on all drip tips or only metal ones? if its only metal does anyone have suggestions on a different type of drip that won't have this problem as much? i really want a pyrex drip tip but for some reason beyond me they are crazy expensive. i don't understand why a pyrex drip tip is like 30 bucks when i can get an entire pyrex tank for 15. but anyway any suggestions? i really like the vicious ant chaplin tips.