Looking for a fast way to clean pipes

Do they make curved brushes for the dirt on top of pipes?

What’s on them and how high up are they?


Pre treat them let them sit and rinse til no more dark water runs off… I do a parking garage that has a ton of these and I just rinse rinse til they water runs off clear…

Oh and hot water helps


They are not big. 1inch probably up to 3 inches