Drifting mildly off topic, anyone have anything good for removing rust stains from a toilet bowl? I’ve been tempted to put on the heavy rubber gauntlets and break out the “hot” cleaner for a couple cleaning sessions, but as the wise ones say, “that stuff will eat the hell out of your drain pipes!” and I’m still sore from the ~21 K from the last drainline replacement. 
(The “hot” cleaner being a 10% HCI solution…)
