Step 1
Mix 1/2 cup mild dish soap with 2 gallons warm water in a bucket. Wet the sponge in the solution and wring it out. Wipe up as much of the spilled or dripped varnish as possible.
Step 2
Spray the immediate area with the spray solvent and scrub vigorously with the plastic scrub brush. Allow the product to sit for 10 minutes.
Step 3
Spray the area again and scrub with the brush. Wipe the area with the sponge and let it dry for a few minutes.
Step 4
Continue spraying and scrubbing with the solvent every 10 minutes until all traces of the varnish are removed. This should only take two or three times at the most.
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Step 5
Use the mop to scrub the entire slate surface. Rinse with clear water and allow the floor an hour or two to dry.