Is it necessary to do wudu or ghusl if a person gets najaasah (impure substance) on his body or clothes?
Question

i have a doubt to ask. once my toilet was jammed with tissue papers.i flushed the toilet to remove it but with no success.finally i put my right hand deep inside the toilet may be some portion above the wrist but below the elbow was dipped. i want to know in this case is it necessary to have bath to be pure or washing hands with soap and water and making wudoo would suffice .will the prayers be valid this way. i read your ques and ans and i also read in which case bath is necessary but i want to clear this doubt which makes me nervous. i would like you to ans this ques to clear my doubts.
Praise be to Allah.If a person gets something impure on his body or clothes and he has wudu, then his wudu is not broken by that, because none of the things that break wudu have happened. But all that he has to do is to wash this impurity from his body or clothes, and pray with that wudu. There is nothing wrong with him doing that. 
See al-Muntaqaa fi Fataawa Shaykh Saalih al-Fawzaan, part 3, p. 23 
See also the answer to question # 5212. 
When removing the impurity you have to do that with the left hand, not the right. If you need to immerse your hand in impure water for a reason – such as unblocking pipes or toilets – as mentioned in the question, do not use your hand directly, wear gloves or something similar. If you must touch the impurity then use your left hand, not your right. 
And Allah knows best.