If you want to apply a high quality real wax try some ZYMOL carbon wax for dark colors. This wax is not sold at most auto parts places thats the cheap stuff. You will have to order it online and a small size container will set you back $50. This is a paste that you rub on and rub off right away! It will make your piano black speakers glisten like jewels.
I use this on my black Porsche 951 too :-)
Matt M
I use this on my black Porsche 951 too :-)
Matt M