Hi Robert,
Water, water and more water. Be careful with bleach as it can cause problems when mixed with other cleaners. I like to keep a little clean water in tank after draining and let it slosh around in the tanks while driving. If you travel I-10 west of Baton Rouge it should break any thing in the tank loose LOL. Calgon does seem to slick the inside up which helps keep tank cleaner JMO
Joseph
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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