Don't know what year, make or model vehicle you have but many have a small screen in there to keep stuff like that from entering the pump. The bigger the piece the less I would worry about it.
2004 Chevy Cavalier windshield washer fluid reservoir retaining bolts. Remove the windshield washer fluid supply tube. The windshield washer fluid reservoir will come free.
should be the same reservoir as the front windshield wipers
The pump for the rear window is on the side of the reservoir and the pump for the windshield is on the front of the reservoir
you have to remove the plastic cover under the fender, after you should be able to figure it out. it's very simple.
reservoir to hold washer fluid
Mounted on the bottom of the washer fluid reservoir.
On ours, it is behind an access panel in front of the RH tire.
It is located on the bottom of the windshield washer reservoir.
The washer fluid for the liftgate is supplied by the reservoir for the windshield ( according to the owners manual )
Do not operate the washer. Remove the washer fluid reservoir and flush it with soap and water until all traces of antifreeze is gone.
The pump should be connected to the base of the washer fluid reservoir.
It is underneath the washer reservoir.