We have all been there before your working on your motors and run out of your favorite motor cleaner! Your local hobby shop is closed or is to far away to make it worth your time to get just a can of motor cleaner.
Take a trip to your local Wal-Mart they have a brake cleaner with a brand name of Primus in a green, red and black can. Make sure it says non-chlorinated that is key if you are going to use any other cleaner on your motors and around your other R/C equipment.
I have used the Primus brake cleaner in place of electric motor cleaner with no I’ll effects for years.
You can also use mild dish soap in warm water, I use Dawn…..NO water will not harm your motors, just make sure to rinse your motor of the soap. Make sure your motors are dry before you use them. Shake them out and let air dry on a paper towel or use an air hose or caned air.