It is not prescribed to probe too deeply when checking that there is no urine
Question

                I would like to ask the following question is it right for a male muslim to open, touch or look at the channel of his private part through which urine comes out inorder to confirm if anything really came out of his private part or just looking at the surface of d private part would be sufficient .what if he sees traces of whitish liquid deep in d or in d channel would his wudu or fast still be valid since the liquid did not reach the outer surface of the private part . ".
Praise be to Allah.
      It is not prescribed for a man to examine the channel of 
      his private part or to look into it in order to make sure that there is no 
      urine there. This is a kind of exaggeration and going to extremes, which 
      is contrary to the easy nature of sharee’ah and is also a kind of waswasah 
      (whisper from the Shaytaan). What is prescribed is to wash the tip of the 
      penis after one has finished urinating. 

    It is also prescribed to sprinkle some water over the private 
    part so as to ward off the waswasah. 
Ibn Maajah (464) narrated 
    that Jaabir (may Allaah be pleased with him) said: The Messenger of Allaah 
     (peace and blessings of Allaah be upon him) did wudoo’ and sprinkled 
    his private part. Classed as saheeh by al-Albaani in Saheeh Ibn Maajah. 

    It says in al-Mawsoo’ah al-Fiqhiyyah (4/125): 
The Hanafis, Shaafa’is 
    and Hanbalis stated that when a person has finished washing his private part 
    with water (istinja’), it is mustahabb for him to sprinkle his private part 
    or his trousers with a little water, so as to prevent waswaas, because when 
    he feels any wetness he will think that it is because of the water that he 
    sprinkled, unless he is certain of the contrary. End quote. 

    Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) 
    said in Majmoo’ al-Fataawa (21/106): 
With regard to thoroughly 
    inspecting the penis by squeezing it etc, all of that is an innovation which 
    is neither required nor recommended according to the imams of the Muslims. 
    Similarly, pulling the penis is also an innovation according to the correct 
    view, and that was not prescribed by the Messenger of Allaah  (peace and 
    blessings of Allaah be upon him).  

    Squeezing out urine is also an innovation which was not 
    enjoined by the Messenger of Allaah  (peace and blessings of Allaah be 
    upon him). The hadeeth which is narrated concerning that is da’eef (weak) 
    and has no basis. Urine comes out naturally, and when it stops naturally, it 
    is as they say, like an udder: if you leave it alone, it will settle down, 
    but if you pull at it, it will flow. 

    Every time a person opens his penis, something will come out 
    of it, whereas if he leaves it alone nothing will come out. He may even 
    imagine that something has come out – which is waswaas. If the tip of his 
    penis touches his clothes when they are cold, he may think that something 
    has come out when it has not. 

    There may be urine at the base of penis and if the penis or 
    private part is squeezed with a rock or finger, etc., some wetness may come 
    out. This is also an innovation. That standing urine does not need to be 
    expelled, according to the consensus of the scholars, whether with a stone, 
    a finger or anything else. Rather every time it comes out, more comes, 
    because it keeps leaking all the time. Cleaning oneself with stones 
    (istijmaar) is sufficient and there is no need to also wash the penis with 
    water. But it is mustahabb for the one who cleans himself with water 
    (istinja’) to sprinkle some water on his private part, then if he feels some 
    wetness he can say that it is from this water. End quote. 

    If the urine does not reach the outside, then it is not 
    subject to any ruling and does not have any effect on wudoo’ or prayer. As 
    for fasting, it is not affected by the emission of urine and a person does 
    not become naajis thereby. 

    And Allaah knows best.