@Davenporrt
Things to try:
Turn that keyboard upside down and rap it many times with your fingers. You might lodge something loose. Because the keys apparently never respond, even to repeated pressing, the keys are probably not at fault. If debris were under the key action itself, the keys would likely work sometimes.
It is okay to blow with your mouth around those keys. Don't do it after eating or drinking anything. Keep it short. The keyboard is meant to be able to withstand some degree of moisture, as it is near your hands, anyway.
Clean the keyboard contacts on the magnetic strip with alcohol or some "lens wipes". Do not use towelettes meant for hands, or soap-based, or ammonia cleaners.
Also, you may use a real rubber pencil eraser to erase the contacts.
More drastic:
Turn on a hot bathroom shower. Let the room steam up. Allow your Type Cover to be nearby for a few minutes. Exposes it to some mist. Then relocate the keyboard to a much drier atmosphere for 30 minutes or so, such as the outdoor cold, or inside a freezer bag with some rice in it. This procedure is like a wash of residue.