Going to weld up this hole first option was mig but i dont have a teflon liner so going to fire up the tig and have a go, i have a piece if 100x50x3 brass backing shop didnt have copper

Any advice on cleaning? I am know to be not so clean and get impurities in the weld

Finger is for reference, was quoted $200 to repair, $300 for a new starter but i need the practice
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