how to wipe the grease off your keys with out turning your laptop on MacBook pro

Can't be done, but if you are understandably concerned about inadvertently entering your login password too many times resulting in locking yourself out of your Mac, you can start it in Recovery mode:

Use macOS Recovery on a Mac with Apple silicon - Apple Support

Use macOS Recovery on an Intel-based Mac - Apple Support

For reference: How to clean your Apple products - Apple Support

Another thing to do is open Text Edit and clean away. Delete file after done. I know it would be ideal to clean the keys with the Mac off, but newer Macs boot on key press.

I have heard of a Terminal command to disable this feature, but entered on a wrong Mac could possibly brick it, so can't recommend that option.