Use Deep Creep. Some of these cleaners are not too easy on some parts in there. I use Marvel Mystery Oil for maint now. A lot cheaper and you can use it in every tank if you want without breaking the bank. If it starts acting up I add some Sea-Foam to the mix. But Sea-Foam is pricing itself out of my market. I feel they are selling name more than product....BerryMans Chem Tech is a good one at less than 1/2 the price but it is a little harsher. I don't like to use it regularly.