I was writing with a Quill pen and I got ink all over my fingers. I tried washing my hands with soap, trying using rubbing alcohol, shampoo, tea tree oil and a few other products and the oil will not fade from my fingers. I tried my best to remove however no success, I’m worried about my prayers. What should I do in regards to wudoo and prayers?

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if the original ink has washed-out and only strain is remaining on your skin then it would ok if you perform your wudhu and ghusl. I hope as you mentioned after using all these soaps and ingredients there shouldn't be remaining any ink on your skin.