A simple solution and less obvious than tape is to paint over the LED (dob it) with nail varnish. Depending on the applied thickness, the LED can be blanked out

A simple solution and less obvious than tape is to paint over the LED (dob it) with nail varnish. Depending on the applied thickness, the LED can be blanked out completely or simply just attenuated to your desired amount. (The tiny brush that comes with the varnish is just ideal for the purpose.) The nail varnish can be diluted with varnish remover or when necessary just removed by it. HOWEVER BE CAREFUL - TEST AN INCONSPICUOUS PART OF THE SURFACE OF YOUR APPLIANCE WITH BOTH THE VARNISH AND REMOVER AS BOTH CONTAIN ACETONE WHICH CAN SOFTEN, MARK OR DISSOLVE PLASTIC. Incidentally, I keep a range of nail varnishes of various colors in the workshop, they're very useful for locking the position of coil slugs and potentiometers, and the varnish can be snap-broken without damage to the components (and nail varnish is usually easier to obtain than coil dope). ANOTHER WARNING — BUY YOUR OWN (DON'T STEAL IT FROM YOUR BETTER HALF OR YOU'LL BE IN DEEP YOU-KNOW-WHAT (I KNOW FROM EXPERIENCE)).