Have you noticed that when you clean weatherboard etc it goes green again very very quickly much quicker than it
Ever did,just a thought.
They're pulling you in mate pulling you in, there's no dangerous wriggly things in your water and hot wont cause you a problem
unless your cleaning with steam and breath it in.
Even the guys who heat their tank water up wont have a problem unless they stick their face in the tank hole and deliberately
breath in the condensation, even doing that the chances of any nasty's getting into your lungs would be very low indeed.
(wont say zero) lol, more chance of picking up a nasty from your shower head.