It takes several hours for my diesel to dry using a shower head and leaving open air for fuel to dry.

That's why a lot of the people on the DryWashing site on this forum don't water wash.

G'day Dwightq;

When I was water washing and air drying it would take about 2-3 hours to fully dry an 80LT batch.

If you click on my webpage and scroll down near the bottom I have links to both my water washing and dry washing methods.

To effectively dry an 80 Lt batch not only circulation and a fan were used but also heat. The heat would help get the evaporation going while the spraying of the biodiesel aided the process along to make it quicker and more efficient.

HTH