Since I bought it at easter, I've only done about 4k miles. And most of them have been one offs of 60-100 miles each way or longer.
So while it gets washed on the outside and windows get done inside and out, and gets it's lights, tyres, oil, coolant, washers and wipers checked regularly, I haven't paid the inside much attention.
I always give the car a decent doing over new year, but this year, with it being wet and horrible, and not having to rush back to work today, I decided rather than risk electroction because I don't have an RCD, I do it bit by bit.
Since I stopped smoking there hasn't been a bad smell in the car, and no yellow film on the windows so I didn't notice how dirty it was.
Haven't bothered since I bought it in Easter, but today, a jug of warm water and some liquid soap in, scrubbed all the vinyl and plastic surfaces. Took about 4 litres of water and it was filthy. Did the door shuts while I was at it. Still need to do something about the seats, but they will get a scrub with "dry" upholstery cleaner once I've hoovered the car out properly and clean the carpets at the same time.
Then it is wash and polish and wax time. Can't believe I've done less than 4k miles since easter considering I did 1k ish in November and was working from March to June in Manchester and doing about 200 a week then.