+ 1
I also occasionally wax the "contact areas" and pay close attention to them. The serving / knock contact the entire loop that contacts the bow tips (both ends and pay close attention to grit, sand debris getting in those areas.
The string, picking up soil can wear the bow tips like a file if care is not exercised after a time. Remember these are areas of movement and pressure. An expensive bow can be ruined by abuse such as leaning on it, dragging it through soil and shooting often with debris in pivotal areas.