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How to remove yellow stone


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I am trying to remive these yellow stains and stones on NQ3 rack of FP230 but all is in vain...

Any liquid for calcium removal from house appliances is of no use...

Does anybody know the simple way to have a rack cleaned?

Please advise.



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very hard to remove as it comes back so easily. Just make sure the crystals won't make rack roller bushings tight, rack tight could create rack transport issue or rack jumps. 

Soak rack in warm water overnight once and weekly in the sink could be a good idea .. my opinion. 

Long long time ago Kodak has a " Fixer System Cleaner powder" ...

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