daniela, it is called a t’nai lehaba. As after it becomes chametz you no longer have rights to it and cannot batel, you state before you start that what may become hametz, should be mevutal ahead of time. Practically that is 18 minutes. When I wash out my bowl and stuff, after it is down the drain, I don’t concern myself with it, and as a plumber, I can tell you that down the drain is icky enough without the bleach or nonedible? detergent. My process is paper towel and latex glove intensive and what gets washed must get dried. And being Brisk-oriented, I have big medicine in Erev Pesach matzos, I just do it for the Halachic thrill. For that run, we torch the paper and sweepings, and do without the gloves. And in certain dry places, like Denver CO, you don’t own what goes down the drain, i.e. you may not recycle to grey water or toss it out on the lawn. Western water rights and the like.
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