You may want to try Goo Gone. It is available in most hardware stores.
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With all proper precautions when using this flammable agent, lighter fluid often works when all else fails.
I have used in the open air outside of the house for removing the occasional anonymous sticky material that seems to afflict the used components we all buy.
Test a small area to check if the speaker cabinet finish is preserved.
Happy New Year, minus the incendiary display!
I have a pair of sl600's, oritinal owner, same problem. I am considering veneering at this point. There is nothing I found that worked, and I started with mild soapy water, then a few over the counter things. Aluminum is a tricky substance to paint, and my guess is that over time, the nextel like finish started to have a reaction to the alum.