The blobs will tell you, water is the best way to hitch a ride.

Use the hose to move objects around and get the blobs to safety. Move the hose with the Mouse and click to shoot water. Press Left/Right to tighten/widen the nozzle, giving you a narrower or a wider jet of water. Get the amount of blobs needed into the hopper before time runs out, and without letting too many die.