I decided to use some bleach on a couple "gifts" from my 17 year old tabby and noticed a foaming on certain spots . It is now difficult to breath and my eyesight is becoming blurry with no alchohol involved . I was seriously wondering if any ammonia in my boys "wizz gifts" may be making mustard gas with the bleach ? Regardless , we are heading out to the patio for the duration.... doors and windows are open and all house flies seemed to have stopped living for the time being . Later !