Homedepot, Lowes' 都有卖。
https://www.lowes.com/pd/Spray-Forget-1-Gallon-Roof-Concentrated-Outdoor-Cleaner/1001041690?cm_mmc=shp-_-c-_-prd-_-pnt-_-ggl-_-LIA_PNT_133_TS-Sanding-Sundries-Surface-Buckets-_-1001041690-_-local-_-0-_-0&ds_rl=1286981&gclid=Cj0KCQjwkOqZBhDNARIsAACsbfK75QLjmWs6H94wtmPJyQKO4Lqr1gLj4VCiFQ_mGTq8pPdSibDB14kaAkAJEALw_wcB&gclsrc=aw.ds