I made an air wand years ago (guess I should have patented it, though probably previously invented and prior art even back then). Anyway, took a regular airgun and either press fit or threaded (can't remember which) a 2' aluminum tube to it. Plugged the end and cut a small axial slot with a Dremel small cut-off wheel. Works really well to clean the fluffy weed seeds from the radiators on the Kubota tractor to keep the air conditioner working. Made a second one to fit garden hose.