Make yourself a vac hose adapter to size down to an air hose and use that while you get the stuff loosened.it will suck it up.
I use that flat vac attactment and stick the air hose in the end and block off the remainder of the slot with duct tape..works fine...sometimes I just use a piece of 3/8" copper tubing..you can bend it to shape so it will get down where you need it..