Determine Working Times - To establish correct removal timings, suitability and compatibility, always test an inconspicuous area before use by creating 6 small test samples of no more than 50mm round with the liquid generously applied. Apply the 6 samples at the same time - spaced sufficiently apart to allow individual washing and removal. Remove 1 sample at a time, at 30 minute intervals. This will give you the correct timing for the product; whichever sample is perfectly clean after washing. This is the timing you will need for the whole area.
After the length of time determined by your test patch, remove the surface coating with a power washer or a stiff brush and running water.