soapy water in engine coolant on 987

[essex red]

Hi everyone,

I have only owned my boxster a few months and the windscreen washer light was on.

For some reason i opened the back uo, saw the cap marked aqua (or something) in german, assumed it was the windscreen washer and poured in about a pint of slightly soapy water.

I realised almost immediately and have not run the car since.

I know i am a limey idiot but please can someome help with what to do?

As you can tell i am not much of a car man but will i need to do anything drastic like getting it picked up on a truck and taken to the garage?

please help