血洗

血 = 丶 + 皿 : Mnemonic symbol: blood transfusion.

Xu Xian hurt himself and needs to get a blood transfusion in the elevator's bathroom. He found a petal leaf as donor, which is bleeding droplets into a bowl; Xu Xian gets the blood from the bowl as infusion using some tubes.

洗 = 先 + 氵 : It's shower day in the space station (Ø3)! Marie Curie (xi) and the FLOTUS (先) help wash (洗) each other using bottles of water (氵).