We have the same experience as you, so for a while we no longer buy apples.

My son had a bite of an apple, and unintentionally left it in our balcony. Two days after, my mom discovered it, still fresh even with the bite. Because it is biodegradable, she threw it in our garden so that it will rot and be a fertilizer. When we were at our garden a week later, that same apple is still fresh as ever!!! And that was a week long of exposure to rain and sun, imagine?!? We know that something was wrong but we just don't know what chemical have they used.

Thank you for this helpful information. We will be mindful of rinsing our fruits and vegetables with warm water.