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I've used a few, at the moment I'm using this one. I bought it from Amazon, although if you find yourself in B&Q sometimes they have it for about 20p less. You dilute it 1 part rust remover to 5 parts water. I keep it in a plastic tub with a tight fitting lid, you can use it many times before it needs replacing. Also it stinks of rotten eggs when it's dissolving rust, need to open a window. HG 176050106 500 ml-Removes Rust Without Sanding-Fast & Efficiently-Long-Lasting Effect by Amazon Learn more: https://www.amazon.co.uk/dp/B000IU3VUI/ref=cm_sw_em_r_mt_dp_FFV6KBK2AYYNCZ6AKTXG?_encoding=UTF8&psc=1 The next mech I just removed the lockout coil and then dunked the whole thing in rust remover without taking it apart. 20 mins soaking, rinse with cold water, 5 mins in a warm oven to dry and a quick wipe over with a brillo it came out nice

The rust remover was unsurprisingly a lot more aggressive and after just 30 mins all the parts were rust free. And also plating free. That said, the plating was generally somewhat corroded so having it all removed actually looks better. So one mech is ready and put back together, the other will be dunked today. In these photos you can see 2 mechs, the one on the left is rust (and plating) free, the one on the right is fresh from the machine. After the rust remover some parts had a very light wipe with a brillo pad.