Bleach is the number one way to kill mold spores, and the Clorox Company is a front runner in the bleach department.  But since bleach is not healthy to inhale, especially when used in confined spaces or over extended periods, it would seem like a good idea for Clorox to make a natural, non-hazardous mold killer using vinegar, tea tree oil or peroxide.  Counterintuitive?  No, especially if marketed under the Green Works label.  This healthier alternative to a bleach based product would allow consumers to use the product on hard and soft surfaces and be safe to use around children and pets.  Also, it would not need to be wiped or rinsed. It could be made available in a reusable spray bottle and in larger bottles of concentrated mold killer formula which can be diluted with water by the customer. 

Bathroom ceilings are notorious for forming mildew and mold and the only way to take care of the problem is to stand on a stool or ladder and attack the ceiling with a sponge or rag loaded with mildew/mold cleaner.  Unfortunately, using bleach can be hazardous to breathe, white vinegar smells awful, and both can drip on the user's clothing or, worse, in their eyes.  My suggestion would be to not only create a healthier alternative to removing mildew and mold (see post on Natural Mold Removers) but also make a telescoping cleaning wand with a triangular ratcheting-head, something like the Rubbermaid Extendable Scrubber* which has a pointed end to get into corners.  Pre-loaded disposable mildew/mold cleaning pads, along the lines of a Swiffer pad, could be affixed to the wand, allowing short people, the elderly, or ladder challeneged users to safely clean the ceiling without fearing an accident or getting cleaning solution on their clothing or in their hair and/or eyes.

Unfortunately, I can't seem to import my drawing of the wand so I've included a link to a picture of the Rubbermaid Extendable Scrubber:

Totally off the subject - why not add a simple pencil type line drawing tool to the above toolbar?

Vinegar is a powerful fungicide and it can kill over 80% of mold. All you have to do is poor vinegar into a spray bottle and you are ready to go. YES!!! The smell can be unpleasant, but it doesn't last long and it's safe to inhale. Use it every day after you shower and prevent mold from building up in the first place.