Matias? Keys just stopped working. We cleaned them (we have people who are trained techs) and they still just stopped working. Two of the keyboards just stop

Matias? Keys just stopped working. We cleaned them (we have people who are trained techs) and they still just stopped working. Two of the keyboards just stopped working for everything. It was weird. Plus they were really cheapish build quality. MacBook Pro - the B key is dead on each keyboard.