Any idea what acid it is? I've been using soapy electric water (link in sig) for derusting small bits, and liberally spraying undiluted milkstone remover (quite potent phosphoric acid) on wire bushed bodywork before priming and chassis blacking, but if there's something else for me to try...paulhumphries wrote:BTW for small items brick cleaning acid (around £5 for 5 ltrs from B&Q and other sources) works great.

I read somethnig somewhere recently about using vit c crystals in solution to de-rust metal, but couldn't remember what to ask for when I went to the locasl agri place (for hopefully worth the money zinc primer).