You could do the following from time-to-time:
open a terminal, then run the following command:
sudo apt-get update && sudo apt-get upgrade && sudo apt autoremove
If you want a kind of cleaning program you could try "BleachBit". If you use BleachBit be sure to set it up carefully - of particular note - if you want it to overwrite erased data you must specify this during the setup procedure.
I use both of these. They work for me.