I'll clean mine with scrubbing bubbles and a dishwasher for the initial disinfecting. A toothbrush and toothpaste every couple weeks to keep the crud down.
I replied earlier (Nov) to this thread. At the time I said that all I do is rinse the razor after I shave and hang it back on its holder and they still look like new. Well now almost 4 months later - that's still all I do and they all look still look like new.
Generally (end of month) for my current rotation of 8 razors. However when I use a razor from my collection on a whim (rotation guest appearance) I clean it immediately after I used it and return it to it's case. Some would say that's anal. "Guilty as charged"!