OK, I managed to open the keyboard, clean it and reinstall the keys. The laptop works perfectly well and every key is perfectly back in its place. I leave here all this information in case someone else has a similar problem.
It is a highly risky and time and patience consuming job but can be done. You can always buy a new keyboard or take it to the workshop but you can try to save the money.
These are my advices and instructions:
1- If some liquid has spilled in yor keyboard, turn it off
immediately (if On) put it upside down
, clean with highly absorbing paper as much as possible (while upside down) and leave it upside down with the screen wide open
over a newspaper for some time (I left it for some hours).
2- Once it's apparently dry it will still be wet inside. Some people advice to let it dry for some days. I prefered to open and clean.
3- Draw the keyboard in a paper to remember later where each key goes.
4- To remove the keys, just pull carefully with a knife or screw driver. There is no way to make it easy and you'll suffer afraid of breaking it, but the keys are flexible and didn't happen to me.
5- When you pull out the keys you will notice that some plastic pieces behind come out as well or you have left them disadjusted. If so, take everything out because it must all be fixed.
6- Once all keys bare out, get cotton sticks for the ears and carefully wet them in alcohol. Not too damp or it will drop around too much. Just humid. Clean the panel carefully. Try removing the dirt and hairs as well. Alcohol is better than Coke, Coffee, etc. It is very volatile and will evaporate soon. The sugar in the drinks make it all sticky. Clean it well taking your time. Then let it dry completely. I also cleaned all the keys with alcohol one by one.
7- This is a photo of my Esprimo without the keys.
8- A closer look.
9- Some plastic pieces were accidentally removed and they are difficult to fix but can be done.
10- A closer look. Try to notice this position of each piece and the pins in the sides.
11- With both hands nd carefully insert the samll piece inside the other. They are flexible, so pull and push a bit to insert the left pin and lower part first and then press to insert the right pin. The pins go inside the tiny holes in the other piece. I was lucky or the pins and pieces are very well donde but none of them broke.
12- Ensamble in this position and insert in the keyboard. Press firmly strating from the upper part and then the lower. Then press firmly from above.
13- After placing the plastic pieces in the keyboard, insert the keys. Be careful when pressing but not too afraid, they are flexible and don't break easily. I pressed a lot here and there until they got perfectly placed. If they don't look èrfect, check the plastic pieces under neath and see if they have got disadjusted. Try many times until you make it. You must here a clear click and see it is perfectly even. Some keys are more difficult (like the space bar) because they have a tiny metal bar underneath that you must first insert in the holes in the keyboard before pressing the key. Just be patient. It's not too difficult.
14- Ready. Good luck.