Making foaming hand soap refills for toddlers

I'm a big fan of using foamy soap for teaching my girls to wash on their own. Because the product is basically diluted soap, it wastes less if they go overboard and also it washes off more easily. With H1N1 season coming I imagine we'll be doing lots of handwashing.

On that note, I've been researching the best way to make a refill. Just adding regular liquid soap to the pump clogs the mechanism. One website I found said to dilute liquid soap with boiling water (I could see how this would dissolve the soap without creating bubbles as happens with shaking). Others suggested a variety of ratios of liquid soap to water. One place suggested 1 oz. Dr. Bronner's to 5 oz. water -- Dr. Bronner's is already so liquidy it's easy to work with.

I ended up going 1 tablespoon standard liquid soap to 3/4 cup water. I combined them in the soap dispenser and shook them up. So far so good. That's a 10:1 water-soap ratio which I read was best for not clogging the soap bottle.

Besides being a cheaper way to go than buying the pre-made foaming soap refills, making your own foaming soap can ensure eliminating an ingredient commonly used to make the soap foamier: SLS. (Sodium Lauryl Sulfate). While I am not super hard core about trying to avoid SLS, it's not something you really want to have in EXTRA doses. There are some pre-made foamy soap refills that don't have it like this Kiss My Face version.

Part of me was also excited about making my own foaming soap because I thought I could make an unscented version. I know scent free is supposed to be best for sensitive skin. But when it comes to my toddlers who are adamant about independence when hand washing I like something with a strong fragrance so I can tell easily if they've washed or not. I ended up used the last of this lemongrass soap I had on hand.