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May 10, 2016 - 11:31 AM
It should be as full as possible, only the wall area that has water and the solution contacting it will get cleansed. Yes, this will work on the grey tank as well.
Sanitation > RV Toilet Chemicals
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May 10, 2016 - 11:31 AM
View all Walex CMDOBG Commando Black Holding Tank Cleaner Questions & Answers
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