[quote=“APFSDS”]I have no clue but it is very cool. Just curious, what is the “Toilet Cleaner” treatment?
Ahah! so there was somebody reading the forum after all. The cleaning fluid I referred to is the type advertised as “Limescale remover”, there are several brands here in the UK including Harpic and Toilet Duck, both are a vivid blue colour. The brand doesn’t matter but it has to be the limescale remover type, presumably some sort of acid. In engineering circles it has been used for many years to disolve the black heat scale found on hot rolled steel. If this scale is not removed before machining the steel it quickly destroys the tool. This cleaner will also remove phosphate, bluing etc. so beware. It leaves chrome and nickel untouched as far as I can see.
I use it to save rusty clips and chargers and to strip the rust off steel projectiles. It cannot get rid of corrosion pitting of course but will eat the rust out of the pits. So, if the object doesn’t retain any original finish then bringing it back to bright metal and stopping the degradation is still an improvement. I simply imerse the object in a plastic container and flood it with Harpic. Check it every so often for progress and turn/agitate so that the cleaner gets at all the rust. When done (I sometimes leave it for several hours) pick your precious object out of the cleaner and flush thoroughly with lots of hot water. Dry it and immediately give it a wipe/squirt of oil or WD40. This is necessary as the steel will be bare of all traces of oil and will react with the oxygen and start rusting within minutes.
Now, all of us have a few rusty bits and pieces lying around and toilet cleaner is cheap so give it a try, then report back on the results so that we can all learn.
But, more important than that, what is my projectile?