Ah well that’s the problem with my approach @ReedRichards if you’re doing a sweep of the keyboard your first breath out is OK, but then you need to take another, and of course you inhale what you’ve loosened off in the first breath, so it’s not the best solution if the truth be told.
Of course if the device is really dusty you can end up coughing and spluttering which totally undoes what you're trying to do!
I was contemplating buying the item (or similar) in the OP of this thread and saved it in my Amazon shopping list. It then occurred to me that I would also like to buy a garage-type air compressor for occasional use, so I figured taking the price of the item in question off the price of a compressor would be a tidy saving.
I'm thinking you'd need to ensure you used a filter in the airline to prevent blowing traces of compressor oil into your electronic devices.
handy for a good Blow out now and again 
