looks like moisture got between your key foil
try hairdrier on low setting to get any moisture out of the keyboard.
open up and unplug battery first.
do not overheat, keep distance
try same from inside, you might have to remove the battery first.
tell wife: when clean, first turn off, unplug, if possible remove battery (old notebooks) then turn keyboard down to face ground and wipe.
I did this with a hand brush with water and soap to get the fly shit off my white sony after a year of use and will have to do it again.
If you do it keyboard down and with little moisture and no battery and then a good wipe with a fluffy towel followed by hand warm hairdryer then it looks as new and you have no problem.
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1981 soldered my first Sinclair computer 1K, tapedeck * 1984 build and sold IBM clones 8Mhz, 512K, 20MB HDD * 2018 messing with ultrabooks