Numbers 1-9 won’t work on my Mac keyboard so can’t log in

Something to try, but you may need a new keyboard as dialabrain suggested.

Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time. You may need to do this 2-3 times.

 Reset NVRAM/PRAM

Try a SMC reset. The article covers when this is required, but doing this will not affect anything. 

Reset SMC

If you damaged the keyboard while cleaning it there is little you can do other than replacing it.