I refinish old decorative metal objects. I use acetone to remove lacquer from brass objects and muriatic (hydrochloric) acid to remove corrosion. I've found that by mixing about 4 parts acetone to one part acid I can perform both functions in one step; however, the mixture seems to go flat after a little while. What's happening? Do you think there is an acid I could mix with acetone that would remain stable? Thank you for your time.