At the brewhouse, we use the most popular sanitizing product for homebrewers - StarSan, produced by Five Star Chemicals. Its great, easy and safe to use. I noticed in our basement that I have quite a bit of another sanitizing product, the second most popular for homebrewers, called Iodophor.
StarSan and Iodophor in the proper concentration are both no-rinse sanitizers, but they work on different principles. StarSan is an acid-based sanitizer, made with phosphoric acid and dodecylbenzenesulfonic acid. It kills wild yeast and bacteria by acidifying the surfaces on which it is used.
Iodophor, like chlorine, is a halogen, essentially a poison to small cell organisms like wild yeast and bacteria. It breaches the cell walls, denatures the proteins and the enzymes that make the cell work. Iodophor is also the product used in the dairy industry for sanitation.
Both products need to be in contact with the surface being sanitized for about a minute. In other words, the surface needs to be wet for at least one minute.
I know some homebrewers alternate between the two products, using one on one brew day, and the other on the next brew day, on the theory that what one doesn't kill the other will. I'm going to bring my Iodophor to the brewhouse and begin to use it on some our equipment. If anyone else wants some, just let me know, I'm happy to share it.