When I used to dig vintage cone top beer cans, covered in rust, we used to have nice results using oxalic acid. Since then while rock climbing straight up a mountain, quite by accident I found a whole bunch of huge crystal clusters. Knowing nothing about cleaning crystals they mentioned using oxalic acid to remove the calcite from the quartz crystals. Since that day, last September, I have climbed at least 1-3 times a week, and always brought home SO many crystals. 4 weeks ago I won an estate sale auction of 5 big boxes of some really nice bottles, mostly not cleaned- and there was this bottle from owl druggists, (castor oil) with this ugly rusted out lid, as well as 2 old Horlicks malted milk bottles, complete with lids which the lids are almost more valuable than the jars. 1 is there very first lid that they used. I had the oxalic acid already out back so put them in- over night? They came out just amazing! You would want to rinse them really well and then soak in baking soda water, for a day or so- they say 7 times longer than they were in the acid, to neutralize the acid. I was afraid they would rust again if I left them that long in that, so I pulled them out after a day. That’s the best way I know of. Another way would be to use something called “iron out” in the powdered form, mixed with water. We use that to remove any iron stains off the crystals. Oxalic is my go-to, though. There’s a short answer! Gloves are important with any of that.Is lemon juice the way to go for removing rust? There is some writing under the rust (or cork, hard to tell) so would appreciate any input. Thanks!
Citric acid would be the way to go.... it smokes, even, so I always wear gloves. Oxalic acid works so well.Lemon juice might work, but I've never tried it. Maybe Vinigar or citrus, or even clr might work. Never tried these though, so mighty work