I am ready to just buy all new posts...tried ultrasonic, scrubbing by hand...simple green, krud cutter. Seems like after I ran them through the ultrasonic it made this stuff worse(?). Is there any easy solution here? I have already spent way too much time trying to clean these. I have 20-30 in this condition. I can scrape it off with my fingernail but that seems a little absurd for the amount I have to clean.