Reducing Heel and Scraping - Liquid Bulk Tanker

I need some advice, or expertise rather in the liquid tanker category ...

We have a product, an industrial primer, which is very thick, that we load into a bulk liquid tank and deliver to the customer. We've noticed an influx in costs for additional heel and scraping from the wash for this one particular product. The residual heel inside the tank is hardening on the walls of the tank, causing extensive labor to clean at the wash.

I am looking and open to any suggestions that could help reduce the amount of heel being left over and/or could aid in preventing the remaining heel from hardening inside the tank before it can be rinsed or washed.

 

It can take a day to multiple days before being washed, depends on how busy the wash is really. The product is not shipped hot, its an industrial primer with a very thick consistency.