You might remember the meaning of the character 擦 with this easy mnemonic:
I never want to clean my umbrellas (扌), fix the roof (宀), or wipe the moon (月) colored two inches (寸) of dust off the table. This really shows (示) how lazy I am.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.