I gotta chime in here, I can't take it anymore , some of you bring a compressor into your house, or drag a hose in there. I'm not doubting this , just a bit astonished that this is really happening somewhere.
I have used the "forbidden" cans for years. I just maintain a vertical position on the can, and bend the red extention to where I need it. I don't ever shake the can before , nor during use.
When I first use the can, each time, I aim the thing away from anything, and release that first bit of moisture that always seems to be there. The can will begin to freeze, and the pressure drops, so , I grab the next can while that one warms up.
I also use a toothbrush on boards that have been sitting for a while, or the ones that need it.
Never had any issues what so ever.