The IBC tote works best with liquids that flow like water. Molasses, honey, some adhesives, pastes and cold waxes go in easily and then refuse to come back out.
Warm it first
Many viscous products flow far better when warmed. Band heaters or heating blankets made for IBCs, insulated jackets, or time in a heated room all work. Follow the heater maker’s instructions and the product’s handling guidance. Never use an open flame on a tote.
Then consider air assist, carefully
Some operations use very low regulated air pressure at the fill cap to help push product out. Standard IBCs are not pressure vessels. Only do this with equipment designed for it, within the manufacturer’s limits, and with a pressure relief in place. If in doubt, do not pressurize the tote.
Then tip it
A tote tipper tilts the tote so the last of the product runs toward the valve instead of pooling in a corner. Several equipment makers sell them.
When none of this works
Some products cannot be drained from a standard IBC without leaving too much behind. Options include a larger discharge valve, a tote designed for viscous products, or a different container altogether.