Not as often as I tell people that I do.
In summer my road* bike gets cleaned really after every ride, because it's light in the evenings and it's no problem to do it out in the back yard. In winter, when it really needs it, it's dark, and possibly raining, and I can't be arsed to put it up on the stand out the back.
* The posh one with big wheels. They all get ridden on the road, although none is a "road" bike as in sporty carbon job.