[RobertP]

The thread mentioned will help you.

There are different ways to do the same thing. You need to do a lot of reading then decide how you want to do it for yourself - or if you want to do it yourself.

I am one of those that does not think twice about cleaning the sensor if it needs it. I don't find it difficult or scary. There are others that are terrified to go near it in case they cause a problem.

My preference is the 'copperhill method' but others claim a giottos rocket blower is all thats needed.... then there is sensor swabs....and probably other ways. All have fans and haters. Have a read up on it and decide for yourself.