Great Long Run

Yesterday in the RAIN, I went out for a nice long run. Not knowing just how long, I decided to drive to the entrance gate to White Tanks Regional Park, From there I ran 4 miles of HILLS to the competitive track (where the Cactus Cha Cha is ran). I then ran for 5 miles on the muddy/wet/HILLY track. There were some crazy people that had gone on the track before me on mountain bikes, so I had some idea of where the deep mud was, and tried to avoid it. After I got through the competitive track, I ran back to the entrance and continued past my truck and ran down the road for another almost half mile and returned to my truck. Overall distance 13.75 miles. The longest that I have ever ran. The best part is that the only reason I stopped is that I had to get home to the family. I had already ran for an hour longer than I told them I would be out there.
The desert was beautiful and green. The ground had short green wild grass all over, all the plants were also green, which is rare to see. It is still too early to see any desert flowers blooming.
My intention was to get a hill workout, since there are few hills around my house and with the Ragnar Relay coming up in a month, I wanted to get some hills. This was also my first time running in the rain, and to do it for three hours was fun. I was soaked to the bone, and NO I did not need nipple guards. However the strangest thing happened to me when I was finishing the run about 1/2 mile from completion, I looked down at my legs and from my shorts to my shoes was covered in white foam. I started to rub my legs and it looks like the detergent did not get rinsed out of my clothes well enough, I just thought how long has this been on my legs?