Blue Strong is slow to evaporate, so it penetrates deep into the pores to remove dirt and oil. In warm countries, it will still evaporate faster and really enough liquid should be used. Unlike the Pearl, Solid and Solid Reactive balls, a Urethane ball should NOT be cleaned after playing. Oil actually keeps the ball soft, which is good for a urethane ball. When playing a match, practice one or two balls with the urethane. The moment the practice stops, clean the urethane ball, your ball will be now in optimal condition. Spray enough Blue Strong on the ball, spread it by hand or with the appropriate small or big pad. With these pads you support the surface to be cleaned. When the liquid is well distributed, wait until this is clearly visible, the liquid has completed its work optimally. Wipe the ball dry afterwards with a clean cloth, after this the ball will absorb the new oil and will retain its effect longer with throwing. Carbon Fiber and High Reactive balls that have been mixed with other substances can be cleaned after throwing your squad, however Blue Strong is recommended for this purpose. Red Perfect also works on Urethane, but will not penetrate as far into the ball as Blue Strong, which was specially developed for these balls and is the strongest cleaner in the world. Note: Blue Strong can sometimes take on a green (sometimes brown) tone, as certain substances in the composition affect the limited blue dye! As a result, we keep testing to keep Blue Strong blue but not very successful so far!