Cleaning a filler neck

momoparman said

Evapo-Rust 00001 - Rust Remover | O'Reilly Auto Parts

Here you go.

Click to expand...

I will try to Evapo rust and see what happens. Trying to figure out best way to soak it. BTW found it at Walmart for $14.88, which is about $5 less than Oreillys.