Epson Perfection V500 - Manual (Page 197)

Lift up the edges of the clips holding the paper path guide in place and push the clips all
the way out of the notches to release them.
Remove the paper path guide in the direction shown below.
Using a soft, dry cloth, wipe the clear portion of the paper path guide to clean off any
dust or dirt.
Slide the paper path guide back into place beneath the white document mat on the
ADF. Then insert the clips beneath the notches and push them all the way back until
they click into place.