Why won't my Audi start after I washed it?

I recently washed my Audi and now it won't start. I have checked the battery and it seems fine, what could be causing this issue?

It is likely that water has seeped into the electrical components of your car, causing it to malfunction. Try drying out the affected areas thoroughly and then attempt to start the car again.

This could also be a problem with your spark plugs. Check to see if they are wet or damaged and replace them if necessary.