I would definitely try blowing first to get rid of dust.
We have a workshop about it here:
If it reassures you about applying direct contact though, you are cleaning the surface of a filter, not the sensor itself, but then I don't think I'd be that happy about the risk of scratching that either.
Has anybody used any of the cleaning brushes with their DSLR? I may get lots of dust in the DSLRs I test, but luckily a blow with the blower brush has so far managed to displace them all.