agree with Trevor. instead of sending away for some moron who may or may not do a good sensor clean, invest your money in these and DIY. Some recommend a rocket blower as well but I don't as using it could stir up more dust in the camera body
Using the white electric brush "Artic Butterfly" build up a static charge by spinning for about 5 seconds before use then
with it switched off brush lightly over the sensor for any loose/soft dust. the swaps are for heavier stubborn dirt.
A little heads up using swaps. Don't flood the swap with fluid you will have a job cleaning off the surplus on the sensor. What I do is put a drop onto a work surface and dip the swap into the droplet , that way you only put a little onto the swab which should be sufficient
cleaning a sensor has no "magic" about it all it needs is a little care.
Your sensor as seen through a Loupe which is a magnifier with lights that
rests on the camera where the lens fits
with this you can clearly see where the dust/dirt is. I have saved a small fortune haiving this kit
DO not even attempt to use cotton buds you will be in deep trouble