Keyboard keys don't work after cleaning

I cleaned the the keyboard on my MacBook Pro 13” Unibody, Early 2011 model, A1278 / 2.7 GHz yesterday using a aerosol duster and cotton swab moistened with alcohol and now several of the keys don't work. I was thinking it was condensation but nothing has changed since yesterday. The Apple dealer says they no longer supply parts for it and I don't see a replacement keyboard available on iFixIt. What should I do? I like this Mac and don't want to replace it. Thanks.