That’s where tools like CCleaner for Mac come in. Computers, including Macs, are similar to cars because they too require some maintenance to run like new.
If you drive your car with old coolant, you can expect it to overheat and generally run poorly. If you never change the oil in your car on time, the lifespan of the engine will be much shorter than it has to be. It’s common knowledge that cars require maintenance to stay in good working order.