Seeing a white spot on one's underwear

Q: Sometimes when I go to the bathroom I see a white spot/stain. The thing is that the stain is there when I am awake. I mean that if I don't sleep for a whole day and then see it is there. Even If I don't get aroused there is a spot. It doesn't feel wet and neither does my private part fell sticky or slimy like its covered nether does my skin. This case is when I haven't slept for whole day after changing underwear in morning. I don't even feel anything if it there or while coming out if something does come out

1. Am I impure?

2. Do I have to change my underwear and do I have to do ghusul? 

Tawassul

Q: On this website muftionline.co.za I was browsing and in one question a person asked if we can supplicate through an intermediary i.e through tawasul of a righteous one, living or dead e.g through Sheikh Abdul Qadir Jeelani...in which the answer was gives yes..I was suprised to see this answer. How could this be possible if it is written dead or even alive. This is a clear form of major shirk. We ask Allah directly. There is no dipute among any knowledgebale scholar or pious predessor in my understanding regarding this. I am 100% sure. How can this be possible. How can a dead person or alive person benefit us when Allah states in the Quraan clearly to ask from Him. Even asking through the Nabi Muhammad (Sallallahu Alaihi Wasallam) is not allowed. Can you please explain?