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Got my wiper arm off the car... Unfortunately the splined shaft came with it. I'm assuming that it's rust that's keeping them together. Anything I can do besides brute force abd liquid wrench?
 

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Soak it in Must For Rust for a while and the rust will dissolve, I take small parts and drop them into a plastic conatiner and then pour in the MFRust until covered. Has worked great for me for a long time. I get it from home depot. It's liquid like water and I pour it back into a separate bottle for reuse.

I soak badly rusted parts for a few days taking the part out every so often to scrape the rust scales off so the chemical can etch under quicker, Parts come out great. Always keep a couple bottles on hand.
 
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