No clue what the detergent is about. IMHO, STOP THAT!
Secondly, I'm an idiot when it comes to huge names like Sodium Metabisulphite (I doubt I even spelled that right), so I'm no help there. I'm sure someone will come along.
Mold though, I can help with. I'm so lazy sometimes that I dont even clean out my brewing kettle until the night before a brew. Mold is something I'm familiar with.
Dish-soap (yes I cringe at the thought also) followed by a couple nice rinses followed by some sanitizer. The morning of my brew, I like to give it what I've dubbed "The Boy Scout Treatment" (as learned in boy scouts of course)...what you do is: Rinse with the hottest water you can muster, scrub real quick with a rag, then rinse with the coldest water you have. Then re-do some sanitizing action, let sit while you brew and do your thing.
My method may be somewhat ghetto, but I've never had a problem in a year and a half.
Good luck to you Kiwi
Black Sheep Brewery
Untamed and unapologetic