Hello

In my opinion you will not be able to clean it properly. Coke is full of sugar. It can be complicated but you can try it.

In worst case you must exchange he keyboard.
So what you must do is to remove key cap for each critical button. It is fixed with small plastic holders. Just take something like credit card but more stabile, put under the key cap and try to remove it. Under the key cap is small key mechanism. Try to clean it up with wet cloth. Be very careful and clean it without much pressure.

When you think it is OK place the key cap in the place and press it down, very gently of course.

You will hear “click” noise and the key cp should be in place again.

I hope you will be able to get it work again.
Please post some feedback.

My thanks to you both.

Removng the caps takes a little effort - more than I was initially comfortable with. But once I was used to it, it was quite straight-forward.

There was clear evidence of residue under the caps, and the mechanism seeemed a little stiff. However,as directed, I carefully cleaned everything i could with a damp fibre cloth, and they now work.

And even after being left overnight to dry out, they still seem ok.

My thanks to all.