In my current show, we are using a bubble machine (DJ grade) to create an effect going into a heaven sequence. The floor has been getting a little slick over time in the area that the bubbles are mainly landing. We have had some success with laying fresh sawdust over the area and sweeping it up. We have also made some progress with a strong concentration of ammonia in water (which was used to great success cleaning large quantities of glycerin based blood in a previous production). Does anyone have any other suggestions of techniques they have used to to clean up slick surfaces?