Solvent losing effectiveness over time

[JBT47]

I have a lot of bore cleaning chemicals and solvents and some of which I’ve had more than 10 years just sitting in the bottles. Do some bore cleaning covered lose effectiveness over a period of years? For instance is my Montana Extreme Copper Killer going to be less effective than when I bought it 10 years ago? What have you guys found? I sure hope the bore cleaning solvents do not degrade and become less effective because I have thousands of dollars worth of bore cleaning products, lubricants, anti corrosive oils, etc.

Thank you.

 

[jxb]

I have Hoppes that's over 30yrs and seems to work the same as when it was new. Probably brand and specific product dependent as to whether something loses effectiveness over time.

 

[M-61]

I have thousands of dollars worth of bore cleaning products, lubricants, anti corrosive oils, etc.

With that amount I can’t imagine some loss would be that upsetting. But I know zero loss is what you want.