The potato and beans trick is the way to keep em away, but you need different timing to get rid of em.
Loosen the soil early in the area, so it warms quickly.
Plant an early
pea crop, and an early squash mixed in.
when the beetles pop out, and lay, then chop and drop, and turn it under.
If you have some
compost, dump it on, and let the bacteria have at the eggs.
Once everything has hatched out, then plant the potatoes.
Think you could overwinter sweet potatoes. If they lay on them, it wont hurt the sweets much to just lop the whole top off, and hot
compost it.
Out here in the desert, we just use black plastic trash bags.