T-Shirt Background Removal

I have a high-resolution PNG of a white tee designed by an artist. The text on the shirt must stay exactly as it is, but every trace of white needs to go. In Photoshop that means turning off “Contiguous”... (Budget: $30 - $250 USD, Jobs: Adobe Photoshop, Background Removal, Photoshop, Photoshop Design, T-Shirts)