Clearing out Custom client

So i looking to find out how I clear/reset the Custom client list with out factory defualting the router.

I am also looking on how to clear/reset the QOS> Source IP or Mac list, cause this list show wrong names and mac adress that arnt on my network anymore, along with fact same things in the list are blank till there selected


What would be commands be to reset the 2 so it can be repopulated with correct names and used mac address on the network?