To Disinfect infant toys, isnt a spraybottle with 2/3 water and 1/3 Bleach WAY too much?

We bring our 11 Month old daughter to the center here in our area. Apparently they have a buncha kids that have intestinal problems and/or rashes that parents cant explain. Is there any site I can go to to get SOLID info on whether it's from the bleach? Or maybe a way to test if it's from the bleach? I have seen a few disinfecting answers here that say like 2 spoons to a gallon of water. I am kinda worried about my child sucking bleach off the toys with them using 33% bleach.