dont understand "delete cache"

ok,so ive been having that problem where the hiroshi has a black interior,ive looked i up and everyone is like "delete your cache" but i have no idea where it is at/what im supposed to delete,im afraid i will break the game

BTW how do you revert the dirt off the D-series and grand marshall and covet?? the windshields are kinda sorta messed up

 

There is a beamng folder in your documents double click that folder then there is a folder called mods and cache, i wouldn't delete the cache folder though because you'll lose your settings also, just go into the cache folder and delete the vehicles folder.

 

ok,thanks for the help