Front brake caliper piston

It strikes me that you could polish the inside of the cylinder and piston with Brasso to get rid of any corrosion that might be holding things up. My pistons were corroded in places and I replaced them with stainless steel ones from Big Red. The cylinders corrode because of water in the break fluid. This happens when for whatever reason it dosn't get changed often enough, it is a tiresome job.
I changed my fluid for silicone. I have found it very good. some people say all sorts of negative things about it but I have had it in the clutch for over a year and the breaks all this summer. It won't absorb water to corrode and make spongy the system, it won't take paint off the car and you don't have to change it again. Still people will poo poo it but they might not have tried it, that's why i put it in the clutch first. I hope this helps. Don't forget the brass bleed screws.

Thanks David,
I met Nick Troth today he's going to rebuild a caliper for me when I send mine over to him. Hopefully then I'll be able to get everything back in place. I won't forget the brass valves.