Plasma thrusters used on satellites could be much more powerful than previously believed

It has been believed that Hall thrusters, an efficient kind of electric propulsion widely used in orbit, must be large to produce a lot of thrust. Now, a new study from the University of Michigan suggests that smaller Hall thrusters can generate much more thrust—potentially making them candidates for interplanetary missions.

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I’d use mercury ion thrusters

Mercury is a industrial waste product of mineral processing that no one knows what to do with. From what I saw and gathered they must react it with chlorine gas to create a salt that can be bundled up safely.

You’d lift the liquid mercury into orbit in a tank then use all that nasty stuff to explore the solar system