Thanks for the tips. I haven't seen them before, sorry!
Yes, my wife's fault is that she didn't turn the laptop quickly and got stuck with a broken laptop.
To keep the story short, last January, the laptop started to shut down because of heat. After contacting Lenovo, they send me the labels to send it for repair, but I told them about the keyboard and they told me that if the maintenance guys felt that shutting down is because of the spilled liquid ("and most likely it is") I'd have to pay for the repair plus shipping, which is alone 50 Euros. So I could have paid at least 100 Euros for a 300 Euros laptop
I asked for the price of replacing the keyboard and they asked for 73 Euros!!! Right!
After searching the Internet, particularly Lenovo forums
I found out that this is a common problem with their cheaper models. Dust close ventilation and laptops shut down from heat. So my wife, being the dust buster that she is, blew away the dust and laptop got back functioning very well.
Next step was replacing the keyboard, I found a replacement in Hong Kong for 18 Euros with free shipping via registered mail. I got and replaced it yesterday. Laptop is back to normal again.
My other, more expensive, Lenovo laptop has actually more protection with liquid. My son spilled coffee on the keyboard as well
alm: but I was quick in dealing with it. I left it to dry for about 4 hours, and nothing happened