After reading on here that Deox-C is likely citric acid with detergents I thought I'd have a go. I love Deox-C but not the price. So off to Wilko for 3 packs of citric acid at £1.75 for a 250g pack: Dug out an old hot tank I made for PCB plating about 30 years ago. Random element and a cylinder stat in the side holds it all at a steady 70degC: Main use today was to free up a seized bearing and derust a pulley assembly on the grass box of my ride on mower. Works a treat, 5.5hrs in it's hot bath & nearly clean enough for masking and priming. Seized pulley lovely and free: Slung a few other bits in at the same time: Deffo a goto process for me now. Tbh smells like the Deox-C process. Did wonder about adding a squirt of Fairy to the mix for it's detergent properties?