Update.
It seems that the odor has lessened dramatically. Last night, I poured a mixture of vinegar and baking soda down the drain and this afternoon, I completely filled the gray tank and added some bleach to the drain water. I don't know which made the difference, but it seems that the odor is almost completely gone.
Thanks for everyone's suggestions.
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Mike&Christi
2020 Montana HC 373RD
2020 Chev 3500HD, CC, DRW, Flatbed
TAMU '99
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