汙

wu̅ = w + Ø1

variant of 污 / dirty / filthy / foul / corrupt / to smear / to defile / dirt / filth

汙 character breakdown

汙
- 于
  - 亅
  - 二
    - 一
- 氵
  - ⺀
    - 丶
  - ㇀

于

yú = yu + Ø2

to go / to take / sentence-final interrogative particle / variant of 於|于[yu2]

氵

shuǐ = shu + ei3

"water" radical in Chinese characters (Kangxi radical 85), occurring in 沒|没[mei2], 法[fa3], 流[liu2] etc / see also 三點水|三点水[san1 dian3 shui3]

氵 = ⺀ + ㇀ : Mnemonic symbol: a bottle of water. Sheldon Shrimp (shu) enjoys a bottle of water (氵) in the Eiffel Tower's living room (ei3). The got the water by scratching (㇀) a blossom (⺀) and catching the leaking dew in a bottle.

于

於

yú = yu + Ø2

(of time or place) in; at; on / (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for / (indicating a source) from; out of / (used in comparison) than / (used in the passive voice) by

于 = 亅 + 二 : Mnemonic symbol: prepositions (in, at, on, to, ...) are what glue the sentence together. Honey is as sticky as glue, so I'll represent 于 by a honey jar.

Yu the Great (于) was assigned to repair the electronics of the space station's kitchen (Ø2), but instead he was snacking honey from a honey jar (于). Unfortunately his capacitor (二) got stuck in the honey and now he has to use a crowbar (亅) to lever it out.