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One of our brothers/sisters has asked this question:

Salaam alaikum wr wb Just a quick question, I work with non Muslims and sometime I shake their hands (non Muslims) after doing my wudu, so I want know whether they invalidate my wudu or not?

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Answer:

Does shaking hand with non-muslim break wudu?

In the name of Allah, We praise Him, seek His help and ask for His forgiveness. Whoever Allah guides none can misguide, and whoever He allows to fall astray, none can guide them aright. We bear witness that there is no one worthy of worship but Allah Alone, and we bear witness that Muhammad (saws) is His slave-servant and the seal of His Messengers.

The mere touching or shaking hands with non Muslims will not invalidate the wudhu/ablution. 

http://www.islamhelpline.net/node/3136

http://www.islamhelpline.net/node/3870

Whatever written of Truth and benefit is only due to Allah’s Assistance and Guidance, and whatever of error is of me alone.  Allah Alone Knows Best and He is the Only Source of Strength.

Your brothers and well wishers in Islam,

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