I made this to clean up my cache folder.

// make a storage disk for the cache location
    $cacheDisk = [
        'driver' => 'local',
        'root'   =>  storage_path('framework/cache')
    ];
    \Config::set("filesystems.disks.fcache", $cacheDisk);

    // grab the cache files
    $d = Storage::disk('fcache')->allFiles();

    // loop the files
    foreach ($d as $key => $cachefile) {

        // ignore that file
        if ($cachefile == '.gitignore') {
            continue;
        }

        // grab the contents of a file
        $d1 = Storage::disk('fcache')->get($cachefile);

        // grab the expire time from the file
        $expire = substr($contents = $d1, 0, 10);

        // check if it has expired
        if (time() >= $expire) {
            // delete the cachefile
            Storage::disk('fcache')->delete($cachefile);
        }

    }

Currently it is just sitting in one of my ServiceProviders, but eventually I was thinking about making a EventListener and listening to the cache driver for 'cache.write' and then running the above code to clean the cache each time I write a new cache.

I have not had any performance problems yet, ...