If you are planning to invite children to your wedding, it is a wonderful idea to put together a thoughtful and age appropriate assortment of toys, candy, and activities to keep them entertained. It's a bad idea to include moon sand. Somebody is getting married either the next day, or the next week, and they would like the terrace to be as clean and beautiful as it was for your wedding. I have tried a shop vac, a broom, a scrub brush, and hosing the stuff off, and it won't go. Now the stains have baked into a plastic-like paint consistency, and we will probably have to replace the tile.