Crisco and Vegetabe Shortening
Vegetable shortening works outstandingly well even when it's warmer. To clean the concrete use plain Dawn dish soap and a bit heavier then you would to clean dishes then spray or power wash it off. After that simply stain the concrete once it's dry. We never had much cause for staining however some trough systems and machines that needed coatings applied would be cleaned before they went in the kilns. We used the Dawn brand original dish soap because it just worked the best.
On an interesting note. The kilns we used to dry and cure the concrete were top loaded with a 20ton crane. As a joke a night supervisor took all four of the smaller forklifts and put them inside the medium sized kiln to hide them. Obviously that supervisor didn't work there much longer and he had his crew do it on second shift.
MH