Here is a pic of what I used for plugging up the axle holes on a f35 trans before degreasing and rinsing with water. They are the little medicine cups the pharmacy gives out for stuff like cough syrup. Fit nice and tight.

 

Any after pics? I use a really good different degreaser.

 

Which degreaser HGT?

 

This doesn't have a solvent smell at all so I also use it to clean all my floor mats and home throw rugs with a pressure washer. My floor mats stay spotless.
For heavy duty cleaning when parts are off car that won't fit in my bead blast cabinet I brush on Carburetor immersion cleaner.