Ria, you need the tried and tested techy method.
1. Set out two saucers, a bowl, an egg cup, washing up bowl with warm and not too soapy water and a sieve.
2. Lay out the keyboard, keys down, on a tea towel.
3. With a small cross point screwdriver remove all the screws and put them in one of the saucers.
4. Gently split the case and carefully life off what was the bottom - the bit with the circuit board.
5. Remove the keys from what was the top and place them in the bowl, put lid in the washing up bowl.
6. Slowly peel the film with the operating studs from the circuit board and give it a wipe on both sides with a damp cloth of glass cleaner - do this a few times
7. Remove the screws holding the circuit board and take it out. Put the base in the washing up bowl.
8. Put a couple of sprays of glass or shower cleaner in the egg cup and brush onto the circuit board using a basting brush or small paint brush. Pat it dry with paper towel - DO NOT RUB. Repeat.
9. Put some of the wash up water in the bowl with the keys and give them a swish. Tip them out into the sieve and rinse. Wash the case parts and drain.
.10 Go away.
11. Come back.
12. Reassemble in the reverse order making sure the keys are in the correct qwerty order and screw together.
13. Plug the refurbished keyboard in to the lappy or desktop.
14. Unplug the keyboard.
15. Lift up the lid of your green recycle bin and drop the keyboard in.
16. Go to Argos (other electrical stores are available). Done.
It's the techy way.