Hi Viken, Sensor cleaning is not difficult to do at all. I use the Copper Hill system and I found it to work well. Not sure whether it's the best - there are other systems/products as well. Copper Hill has a video on their website that shows the process. Cleaning the sensor on your D300 ought to be a snap. You may also want to read Thom Hogan's notes on sensor cleaning...hopefully others will join in for more advice.
I, too, use the Copper Hill method. I was a bit nervous the first time but, after carefully reading the instructions, it turned out to be a non-event. I have had to do the wet-cleaning a few more times since then, and it is now a normal part of routine maintenance - when the blower can't remove the dust bunnies I move on to the wet-cleaning.
I too am in the UK, I bought Visible Dust oil mark removal fluid and their swabs to do the job WEX photographic stock these ( www.wexphotographic.com ) or go to the Visible Dust website. It is a bit daunting the first time, but really there is nothing much to worry about - other than wrecking the sensor. You would probably have to be related to the Hulk to manage that.
This thread in the D600 Forum is the best I have seen on the different aspects of sensor cleaning. We could anchor this one in every forum as it had good, sound advice and a progression of options from simple to more advanced.
>Why are cleaning swabs so expensive? They must cost a tiny >fraction of the retail price to produce. To cost of Visible >Dust sensor cleaners in the UK is around £30. Crazy money.
I agree wholeheartedly - but:
The actual plastic is a closely inspected highly accurate moulding, the "swab" is a very finely constructed lint free item and the packaging must cost a small fortune. Additionally there is only a small market for the item, so mass production savings are unlikely. Then you must add marketing, transport and overhead costs.
Agreed - they ask silly money for the items, but it is pay up, or go without!