Heater AC control push button restoration

Tape a piece of paper towel down to something like a 2 x 4. You want it to be snug to whatever you tape it to. I used one of those blue shop papertowels and a short 2x4 piece of scrap I had laying around. Get you some white paint and brush it across the letters then quickly hold the button 90° flat to the paper towel and wipe off the excess. This will leave only the paint that's recessed into the lettering and wipe off the paint on the button surface above it.