speaker cleaning

Not really electrical problem more of a make it shinny kinda thing.
Cleaning the metal parts of the speaker assembly and there is a gooy grease like substance.Is this some sort of factory coating.As the part numbers painted on the metal seem to be on top of the goo.I will like to clean this off. I have tried paint thinner, engine cleaner , carb cleaner no luck.
Any ideas?

I know what your talking about. Ithink it is build up over years. Sometimes i clean grease, with grease. I have had grease on stuff used vaseoline to get it off.

Probably kitchen grease and dust baked on with time. try 409.

Try a mix of 409 60% and amonnia 40%. Try it where you have fresh air..Should clean it all off ok ..Sprman : )

Thanks . I will give these a try. Never thought of vaseline ...