Decided to give my C1 a thorough overhaul before winter, including shot blasting and powder-coating the steel frame holding the radiator. I noticed that many of the fixings (U-brackets especially) along the way were badly rusted, so did my usual trick of soaking them overnight in vinegar. Quite an improvement for most of the parts but two U-brackets were still seriously rusted up and would need further wire-brushing and sanding. All rather fiddly. I wondered what would happen if I put them in the ultrasound bath (Lidl's finest) in vinegar. Amazing! You could see the rust just falling off. A light sand afterwards, clean in white spirits and they are now ready for a coat or two of spray Hammerite. I have treated all the other fixings to this process and they have come up almost like new.
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