Originally Posted by SloopJonB
If you have to use pressure washers or boiling tanks at a rad shop or ultrasonics to get the crud out, isn't it likely to be stuck so fast that it will just stay there in normal use?
This is an interesting question and one that I do not know the answer to. It would be nice if someone good at biology knew about this one. I can imagine scenarios where the growth eventually comes off the walls or it encourages more slime/growth but I am only a mechanical guy, this is out of my realm.