If you cleared any contacts, the remote buttons might now be working. Now is a good time to reassemble and test. Since cracking the case open is probably a chore, let's not do that again unless we have to. If we are lucky, we can test without complete reassembly.

With the LG remote that is under repair, I found that I could put the circuit board back into the case bottom, followed by the keyboard membrane. After putting the batteries in place, I could test the keys without replacing the top part of the remote. If you can do this, it will save a lot of work.

Thoroughly test all buttons to see if they work. Take note of any new failures, or any buttons that were repaired by your cleaning. In my case, the Power button was still not working, but all the others were fine.