1. 从后窗喷水管接一 “T”管
2. 连接到对准倒车摄像头的喷嘴。后窗喷水时也一并冲洗摄像头。
It should be very useful in winter, at least for me.
Windshield washer nozzle from EBAY:
https://www.ebay.com/itm/Brand-New-Windshield-Washer-Nozzle-Kit-A002/292431996382?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649