Hammerite Rust Remover: So-so. Me thinks it'll take lots of coats...I'll go attack with alu foil. Update: It ain't great, some rust comes off no problem, other rust is barely touched. Even with wet alu foil. So meh, don't buy.
Bilt-Hamber Deox-C may have been better, but of course you can't get it in shops here. http://www.bilthamber.com/corrosion-protection-and-rust-treatments seems to be The Shit.
@JWestland started
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Hammerite Rust Remover: So-so. Me thinks it'll take lots of coats...I'll go attack with alu foil.
Update: It ain't great, some rust comes off no problem, other rust is barely touched. Even with wet alu foil. So meh, don't buy.
Bilt-Hamber Deox-C may have been better, but of course you can't get it in shops here.
http://www.bilthamber.com/corrosion-protection-and-rust-treatments seems to be The Shit.