Question Backspace key not deleting and adds a + sign when I try to backspace..

[IGBT]

I cleaned the keyboard today and ended up with my backspace key not working as usual. Do I have a stuck / locked key somewhere??

 

[IGBT]

Turns out someone spilled coffee on the keyboard. Thanks God it was black / no cream and sugar (what's wrong with you people that have to screw up coffee with cream / sugar??) ..so the keyboard is now fine once it dried out. Thinking of replacing it anyway...