Pavement Markings, no matter the type, all suffer from oxidization over time, as well as deposits of rubber, dirt, dust and other items that all effect the reflective capacity of the beads embedded in the marking, as well as the color and general look of the marking.
Often times what is considered a failing line can easily be cleaned up to appear fresh and provide the maximum reflectivity once again, at a fraction of the cost of re-striping.
Process and important notes
The markings are cleaned through the process of medium pressure water blasting with an attached vacuum to suck the blasted debris from the line. Once the equipment has blasted the line, it leaves a clean surface that is dry in about 1-2 minutes, with no standing water nor additional need for traffic control except for around the equipment.
Marking rejuvenation works well as long as the marking has good adhesion to the pavement surface, and the beads are well embedded into the line. Marking failure can result if those two conditions are not met.