Ugg Boots are generally made of Sheepskin which can be very porous. Sneaky Spray will certainly help improve water and stain repellency of your UGGs. We recommend to always apply to to new Uggs and ensure your Uggs are clean and free of dust and dirt. Spray Uggs until completely wet – this ensures the sheepskin has bonded with the formula. Leaves to dry for 24-48hrs. Repeat the process to ensure maximum protection. For generally cleaning of dirt and marks we would recommend you use a dry cleaning solution like our Sneaky Eraser.