Engine flush can be a useful tool for removing carbon build-up in an engine, but it's important to understand the purpose and how it works before performing one. Engine flushes are chemical solutions that help break down the sludge and grime that builds up inside of an engine over time. This build-up is mainly composed of oil residue, dirt particles, and carbon deposits left behind as a result of combustion. By using an engine flush on a regular basis, unwanted buildup can be removed from the internal components of your vehicle’s engine, allowing for better performance and fuel efficiency. When it comes to removing carbon specifically, engine flushes work by breaking down these deposits into tiny particles which are then expelled through the exhaust system when you start your car after performing the flush. While this method isn't always 100% effective at removing all traces of carbon buildup in an engine, it does provide some measure of relief from these unwanted accumulations if done regularly enough.