Question
someone sprayed my plants with a cleaning spray, some are ok (just) and some have died. What can i do?

Answer
If you had washed the leaves off (use plenty of water) right away then there should have been little damage. Sounds like it has been a while since this happened--the leaves have absorbed the substane into there system and this was transported to the roots.  You might try completely washing foliage and if the liquid got into the soil maybe changing the potting soil also. But I would guess the it maybe too late and the plants have absorbed the substance and will more than likely not make it. Sorry!