Ha, the amount of people wanting the bumper removal guide.
Its so easy to do, i can have it off in around 2 mins flat.
Solution to your problem:
Anyway, the water in your headlight, i had the exact same problem. Left it in the airing cupoboard for a day and it disappeared so i put it back on the car, left it over night and the water was back again!
In the end i drilled two very small holes in an inconspicuous part of the headlight, such as either corner and sure enough the water has gone now and stayed gone.