Rear cross member surface rust

When I did mine last year it was mainly surface rust so I cleaned it back with a flap wheel, painted the bare metal with Electrox (from these people). It's not the cheapest zinc paint but it is highly recommended by many of my friends who restore classic cars. Once dry I then painted the X member with Hammerite satin black.

I also used the Bilt Hamber wax for inside the X member.

I'm trying to clean out the inside of the chassis, mainly the cross member. I've sprayed water into some of the various holes and no end of crud has been coming out. Shall I just keep doing this till the water runs clear? Or should I try and steam clean it? If so do you reckon I can just attach a hose to a wall paper stripper, or is something with a bit more pressure required?

M

rear Xmember is easy, you can get to the back of most of it.
propper steam cleaner is pressurised, a wallpaper stripper aint gonna cut it.
Im aiming on a jet wash for mine (cos I got one) and keep going till the water runs clear (please no hosepipe ban this summer )

Thats good. I'll just use my pressure washer. I'll try not to take to much paint off in the process. Cheers.
Are there any other nooks and crannys on the chassis that need extra special care, that I might miss?

outriggers, muck collects on the top of em too.