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Treating a Gasteria excelsior for Scale

I mixed a 75% solution of alcohol and sprayed , rubbed with quetips and cotton swabs multiple times and some of the spotd keep coming back. I do not want to rub too hard or over work this. Should I also work it with a solution of Dawn soap and a sprayer? Can You tell that I have not done this before? Any advise would be apreciated?

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