Is it true that the rain is the best cleanser for my artificial turf?

Well, this is a very good question. The rain will definitely help cleaning up your artificial grass and more importantly, it won't get messy or muddy like real grass, the rain water will simply rinsing through your artificial turf and give it a "bath". However, I don't know how "clean" it will get as everyone's expectations can be different. 

My personal experiences are that right after the rain, we can walk on it and the artificial grass looks and feels very clean to me, there still is some water and moistures trapped in the artificial grass, but not significant enough to bother me. Regardless, having the artificial grass to replace your real grass lawns in the rainy areas is a great idea and very practical as well!