There is a video Kate always refers to for newbies..
But the idea is:
You pull out the foam from the cart with tweezers ,
remove the plunger from the syringe, pop in the foam into the main tube
put the plunger part back into the syringe & squeeze down..
excess liquid reamining in the foam will drip out into a container of your choice..
Been doing it all this week & recuperated so much more than I expected..!
Too bad I didn't know this after months of just rinsing/washing out the foam- big waste!
Mist