I'd get that machine cleaning well and jazz up the bay with some cleaning and new colored led lights etc. You could make the machine appear new with a vinyl wrap and some cool decals.
What exactly is the reason it's not cleaning? Friction is effective; we all agree on that. If the mechanical aspects are functioning normally, maybe try better chemicals. Find the owners manual for the unit and read through it. Study the manual until you become familiar with the operation of your equipment. Look at the troubleshooting section and see if they have things to adjust if cars aren't coming out clean. It could be something as simple as clogged foot valves or chemical injectors not working correctly.