The window cleaner is a mix of window cleaner and black acrylic paint (two or three drops of paint, just enough to make the liquid a bit cloudy) and wash over the helmet, then gently blot it off with a paper towl. Repeat as you see fit. DO NOT use steel wool on your helmet, it will ruin your paint job. You can take a fine scotch brite pad and rub it down a bit to dull out the colors and help blend them. I also coat everything with Testor's dull coat (do not add a clear coat to it as it will change the colors drasticly..learned this the hard way)
The pink color on the mandibles is Piping Pink from Floquil, I have been told this was the actual color used on the real one. Good luck finding it though. I had to use Model Masters paint for this one color and it didn't look quite right so I added a bit of grey to it to make it look right. I did my pink as it's own layer, but it is clearly too late for you do to that, so just take a pencil and outline where you want it to go, and then paint it on with a fine brush, then erase the pencil with a normal eraser.
If anyone has any other questions or need advice on painting a Pre-pro2 helmet let me know as I have done it several times and have put hours and hours of time into research for it.