If you live in an area with hard water, the hard water can react with the natural fats from the oils and create a white "film" on your concrete or pavers. The longer the oils and the hard water have to react, the harder it will be to rinse off - making it look like a white film.  To avoid this, wash your dog in the grass! If you do wash on concrete or pavers, we recommend rinsing it off into your yard  immediately after you bathing. 4-Legger is 100% biodegradable, safe, and non-toxic. It won't harm wildlife or your 4-Leggers!  If you do forget to wash it off and you do get the white film, you can use vinegar to clean it off! Also, remember you don't need a lot of product for it to work! Go easy when you are pouring it out!