I just came to say that if all they got was HCL conc. (37%) then there's not much to worry about, unless you get some in your eyes, or lungs.
Got a bit of 20% HCL into my eyes once, didn't feel so good (only very superficial damage to the outermost layer of the eye, slightly irritated for a few days, no permanent damage).
Also poured 37% HCL over my hand once, rinsed with waster immidiately. No damage at all, not even slight reddening. HCL on skin does nothing.
Same would go for ammonia.
H2O2 could blind you instantly, hot conc NaOH-solutions can be nasty, but the real danger would be 98%+ H2SO4, which will burn off your skin. HNO3 69% will leave huge nasty scars too, but that one seems not to be on that list.