I know there are various threads on this but I have to ask anyway. I want to clean my pipe out because at this point I've scrapped out as much resin and **** as I can and it's still pretty clogged up. The problem I have is my pipe has this black, hard plastic design looking thing on it. I want to know if there's a way to clean my pipe out and not ruin that design thing. Any suggestions would be most appreciated.