For cleaning on brew day, I use PBW. I buy it from my LHBS..I usually get 1 lb for about $5.00 and it lasts several brew days and bottle days.
However, I do use OxiClean Free (the green container) when my equipment has a lot of gunk on it. Typically this is to clean my primary after I bottle or to clean equipment after brewing. I fill my buckets with about 5.5 gallons of water and 1 scoop of OxiClean Free. I put my equipment in with it and let it soak overnight. Then I rinse everything really well and after it dries I store all the equipment until next time.
I've always read that it was important to get the OxiClean Free in the green container, as it is dye, perfume, and chlorine free so it will not harm your equipment or leave behind unwanted smells or chemicals.
As kcbeersnob stated, the OxiClean will act as a cleanser and you have to rinse everything well and then proceed with sanitizing. I recommend StarSan (an acid based sanitizer), but have also had success using IoSan (an iodine based sanitizer).