After fitting the boot floor I needed a break from alloy sheet so moved on to cast iron. The front brake calipers needed to be cleaned up ahead of a rebuild and re fitting. I had seen on You Tube a guide to electrolytic rust removal. Simple really, put the item into water, spoonful of baking soda and wire it up to a battery charger and a day of so later item comes out looking like new. Nothing to it, dead easy and works every time. The reality is it does!!! It worked so well I did mine twice. On the first attempt the caliper came out looking like it went in and just wet. I then set about it with a scrapper and wire brush and all the rust fell away so easy leaving a clean surface ready to paint. I did mine again just to see if I could get a couple of patches of rust which were difficult to get to to come clean.

So, a few pictures to show how it all went:

Once I had done all the parts I painted them with black Hammerite and rebuilt the calipers with new seals and covers. and then assembled them on the uprights. Very happy with the result. 

As for the process it is so simple yet very effective.