I have to sand down an intricate cast iron bench for repainting.
It has lots of holes that I have to sand the inside of.

Is there an easier way than doing this, by hand or with a detail
sander, perhaps some attachment to an electric drill that I
have missed?

Or perhaps, I might be better with paint stripper and a hose?

It doesn't need to create a perfect finish just one that the
new paint will stick too.

tim