Who does not know it - the best tweezers  is useless in cause of cement- or colour-rests,  no good grip, small parts are jumping through the room - in best way in the deep of a  carpet or  under a cupboard .... some expensive photo-etched-part  was lost on this way.

To save the tweezers, where is an easy and simple way:

Grind the tweezers using a diamond-flex at your Dremel with light pressure, to rid of the dirt an become paralell jaws

Then glue fine sanding-paper using Loctite or other Acryl-Acethat, and let them dry

Then cut hte not used paper et voila .... a well-useable tweezers

Happy Modelling
Wolfgang