I think you can find it in a hardware store.
20 Mule Team Borax is just a brand name of borax. They are the same thing.
According to the manufacturer's web site, 20 Mule Team Borax is composed of sodium tetraborate.
The only place that I have been able to find "20 Mule Team Borax" in Columbus, OH is at Target. Here is a direct link to help you out: http://goo.gl/L2HlP
20 Mule Team Borax does not indicate on the package for use of getting rid of mosquitoes, although some people have had positive results using the product for getting rid of them.
Ace Hardware, Amazon and Sears.
20 Mule Team Borax
Twenty mule team borax
Death Valley Days
im not sure but 7dust dose
"Rosemary DeCamp"
20 Mule Team Borax would be too harsh on a dog or cat's coat, would strip all the natural oils right off of them. Find a shampoo made for cats, it will say so on the label. You can find this in Pet supply places or pet shops. Just make sure the shampoo is made for cats & that it states this on the label.
It won't hurt the glaze, might degrade the grout a bit, but be sure to rinse well.