basslover34;2978091; said:Not sure of that since I know that CLR Contains some pretty serious acids... Could be worth looking into if all else fails.
CLR is a goo as a last resort. What sucks is getting it out.
1. Use CLR
2. Rinse tank obsessively
3. Clean with Vinegar
4. Rinse tank obsessively
Some throw dish soap in there too.

