I mean, even though it generates vacuum, I wouldnt just be trying to suck it out of something on the ground. Is it really that big of a deal to pick up your antifreeze container to shoulder height or even let it sit on the rear lockers or swim deck while the boat is running? I agree with what everyone else is saying in the last few posts. Id run it for a while to get the engine nice and hot and then I would circulate antifreeze and either completely drain or partially drain all compartments. This ensures that even if you dont get everything drained, well then theres probably antifreeze wherever theres leftover water.