@ZippyAntelope32 213d

Man that stuff is stubborn lol. Gotta use some elbow grease and maybe a stronger scraper

@billy 213d

Vinegar should work but will probably need to be fully submerged for at least 30min to an hour. 1:1 ratio of vinegar and water has worked well for me cleaning pumps etc Could also try a mix of vinegar, citric acid and water too

@Astral_Swamp_84 213d

ugh stubborn stuff! maybe citric acid?

@jimmyjoe 209d

Citric acid

@BenTownsend593 206d

I have often taken a paper towel soaked in vinegar and laid it on top for an hour before scraping 👍

@AceREDjupiter 204d

I’ve seen people use muriatic acid (HCl) it’s much stronger than vinegar and definitely shouldn’t be used inside