Mixing two common household/bathroom cleansers WILL generate poisonous gas;we had a new janitor nearly kill himself that way.And the management of an upscale restaraunt removed and banned one of those from their stores,because if only one of the two are used,either is perfectly safe.Mixing the two is disastrous.
Same situation where I used to work: cleanser (containing bleach) was still on the custodial supplies stock list, but ammonia had been dropped.
We had a good custodian who bought his own ammonia.