Please understand that with water washable resin you should not wash it directly into the drain, as it is toxic to the environment.
Water used for washing resin parts should be cured under sunlight or a UV light until the resin in it solidifies, then you may pour it out.
I drain mine into a juice bottle and set it outside when its above freezing, or use my UV light for when its freezing outside.
I hope everyone that uses water washable resin is doing this!