Toilet.......
Turn off water supply
Disconnect water line to toilet
Remove the hold down bolts (just like residential)
Remove toilet
Clean floor flange....install gasket that comes with new toilet
Set toilet
Tighten hold down bolts......snug, just enough to compress gasket and so toilet is solid
Hook up water supply (NOW is a good time to install a shut off valve)
Turn on water and check for leaks/toilet operation
As for the grey tank (and black tank) cleaners........unless tanks are really dirty with crud built up FORGET about all them chemicals, deodorizers, enzymes etc. The tanks are HOLDING tanks not septic tanks.
Dump them when they are full (almost full---higher the level the better)
Rinse/flush
Add couple gallons back into tank after dumping----keeps tank bottom wet so crud doesn't build up/dry out and STINK
Water is the only chemical you really need.
