Keyboard Cleaner - plok
"shields your desktop and intercepts every keystroke you might accidentally make — except for Command-Q."
Supercharge
Cleaning Mode is one of the tweaks.
"Makes your screen black and disables keyboard and mouse to let you safely clean your device."
Kleanly - Clean your Macbook like you always wanted to!
"With just a tap, Kleanly lets you completely disable your keyboard and trackpad, allowing you to clean them without turning your Mac off."
- Great Tools for your Mac!
"KeyboardCleanTool is a super simple little tool which blocks all Keyboard and TouchBar input."
CleanupBuddy
"CleanupBuddy locks the keyboard and mouse/trackpad so that you can clean your Mac without having to turn it off and without typing a bunch of gibberish during the process. It also includes an animated character and snarky remarks to keep you entertained!"