Believe me I've tried Kevin. Blown with Rocket several times.Time for a cleaning.
I use the visibledust smear away cleaning kit, works very well. You get 4 swabs and a small vile of cleaner. I can get 3 wet cleanings out of it, goes for about $25 at B&H. Make sure you get the right size for your sensor..
Thanks but of no use to me sitting here in li'l old New Zealand!