I do mine every wash but I have serious problems!!! There the sort of thing I notice when looking at a clean car and its surprising how many don't bother IMO let's the car down. I clean hinges and sills on the boot as well! But I probably go to the extremes when cleaning it. I'm not so bad towards winter as they generally get so dirty so quick.
Toothbrush, tiny paint brush, pretty much anything that i can use to get into a gap and agitate the dirt gets used. I'm totally over the top when i'm giving the car a clean, but that's the way i like my car to sit!