Thank you very much for your question. It is our pleasure to answer it.

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.

You should know that there are certain thaings that invalidate wudu' (ablution) as follows:

1- Discharge that comes out from penis or anus like urine, stool, wind, sperm, madhi, etc.

2- Emission of urine or stools from anywhere other than the urethra or anus.

3- Deep sleeping breaks wudu'.

4- Fainting breaks wudu'. (Having an epileptic fit or insanity invalidates wudu'.)

5- Touching one's penis.

Therefore, if you touch something impure, it will not invalidate your ablution. However, it is not permissible for you to pray until you wash it off.

I hope this answers your question.