noun
applicator
AP-lih-kay-ter/ˈæplɪkeɪtər/
A tool or device used to put a substance onto a surface.
The foam applicator spreads a smooth strip of paint across the board.

Etymology
The roots “to” and “fold” underlie Latin applicare, “attach or join.” Bringing things into contact is the useful connection: an applicator puts a substance into contact with a surface.
In context
you need an applicator this is what is going to actually scrub your window and apply the cleaning chemicals
More examples
- The bottle includes a brush applicator.
- Discard the used applicators after painting.
- The narrow applicator reaches inside the corner.
Forms
applicator · applicators