I try not to use oven cleaners and Gunk degreaser. Some will damage aluminum, rubber, stainless and bla bla bla. I pretend that Simple Green, et al, are biodegradable like everyone else does.
The fact is, if you pour it on the ground or in your toilet, it is!
After you clean your motor with it, it ain't. It's got oil, gas, grease, antifreeze, ATF, liquid Freon, rat poop, paint, oven cleaner, road tar, animal guts, acid rain, plastic, rubber, WD-40 and various automotive additives...in it...and must be taken to a nuclear disposal site. So where did they get the "Simple" part?
