The green goo from inside my squidgy stress ball toy is awesome, and a piece of it turned out to be the ideal thing for removing black aphid from a spider plant.

Bit of synchronicity going on there then :-)

Before I got to this bit, I was going to suggest a spray bottle of washing up liquid solution, which is what I use for aphids on the allotment if there are too many for the ladybirds to keep under control.