You can get a cleaning kit at auto parts store,Walmart..Walmart will also clean and polish them for around $40.
It is less expensive to have them cleaned and refinished. Just about any mechanic can do it.
Just call Kia parts and supply dept. At your local Kia dealership. They will be able to tell you how much it will be to replace.
Go to Amazon n order you a set
I don't know call them and they may help
I can't tell you because i don't know i never needed any
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