Lyman Turbo Sonic cleaning solutions for steel and gun parts. Rather expensive but I reuse the diluted solution. When finished I just put the fluid in a plastic container with a snap on lid. Sometimes I filter it through a coffee filter if there’s a lot of crud in it. Have never had to throw away the stuff and renew it. My bottle will probably last a lifetime (which ain’t saying much at my age).

When an old man dies a library burns to the ground. (Old African proverb)