Water box?
I don't know, I usually just drive though it, spin the tires to clean off but the problem is, the residual of water will cling to fender well and might get layed on the track as you make the pass, which isn't great for other drivers.
Try to go around with the fronts if the rears get wet or not do a burn out untill you see some smoke this will get the water off and the debris as well. Much after first smoke is a waste on street tires,



